コレクション · 4D Documentation

The Collection class manages Collection type variables.

A collection is initialized with:


New collection {( ...value : any )} : Collection creates a new empty or prefilled collection
New shared collection {( ...value : any )} : Collection creates a new empty or prefilled shared collection

例題

 var $colVar : Collection //creation of collection type 4D variable
 $colVar:=New collection //initialization of the collection and assignment to the 4D variable

Summary


.average( {propertyPath : Text } ) : Real returns the arithmetic mean (average) of defined values in the collection instance
.clear() : Collection removes all elements from the collection instance and returns an empty collection
.combine( col2 : Collection {; index : Integer } ) : Collection inserts col2 elements at the end or at the specified index position in the collection instance and returns the edited collection
.concat( value : any { ;...valueN } ) : Collection returns a new collection containing the elements of the original collection with all elements of the value parameter added to the end
.copy() : Collection .copy( option : Integer ) : Collection .copy( option : Integer ; groupWithCol : Collection ) : Collection .copy( option : Integer ; groupWithObj : Object ) : Collection returns a deep copy of the collection instance
.count( { propertyPath : Text } ) : Real returns the number of non-null elements in the collection
.countValues( value : any {; propertyPath : Text } ) : Real returns the number of times value is found in the collection
.distinct( {option : Integer} ) : Collection .distinct( propertyPath : Text {; option : Integer } ) : Collection returns a collection containing only distinct (different) values from the original collection
.equal( collection2 : Collection {; option : Integer } ) : Boolean compares the collection with collection2
.every( methodName : Text { ;...param : any } ) : Boolean .every( startFrom : Integer ; methodName : Text { ;...param : any } ) : Boolean returns true if all elements in the collection successfully passed a test implemented in the provided methodName method
.extract( propertyPath : Text { ; option : Integer } ) : Collection .extract( propertyPath : Text ; targetPath : Text { ;...propertyPathN : Text ;... targetPathN : Text } ) : Collection creates and returns a new collection containing propertyPath values extracted from the original collection of objects
.fill( value : any ) : Collection .fill( value : any ; startFrom : Integer { ; end : Integer } ) : Collection fills the collection with the specified value, optionally from startFrom index to end index, and returns the resulting collection
.filter( methodName : Text { ; ...param : any } ) : Collection returns a new collection containing all elements of the original collection for which methodName method result is true
.find( methodName : Text { ; ...param : any } ) : any .find( startFrom : Integer ; methodName : Text { ; ...param : any } ) : any returns the first value in the collection for which methodName, applied on each element, returns true
.findIndex( methodName : Text { ; ...param : any } ) : Integer .findIndex( startFrom : Integer ; methodName : Text { ; ...param : any } ) : Integer returns the index, in the collection, of the first value for which methodName, applied on each element, returns true
.indexOf( toSearch : expression { ; startFrom : Integer } ) : Integer searches the toSearch expression among collection elements and returns the index of the first found occurrence, or -1 if it was not found
.indices( queryString : Text { ; ...value : any } ) : Collection returns indexes, in the original collection, of object collection elements that match the queryString search conditions
.insert( index : Integer ; element : any ) : Collection inserts element at the specified index position in the collection instance and returns the edited collection
.join( delimiter : Text { ; option : Integer } ) : Text converts all elements of the collection to strings and concatenates them using the specified delimiter string as separator
.lastIndexOf( toSearch : expression { ; startFrom : Integer } ) : Integer searches the toSearch expression among collection elements and returns the index of the last occurrence
.length : Integer returns the number of elements in the collection
.map( methodName : Text { ; ...param : any } ) : Collection creates a new collection based upon the result of the call of the methodName method on each element of the original collection
.max( { propertyPath : Text } ) : any returns the element with the highest value in the collection
.min( { propertyPath : Text } ) : any returns the element with the smallest value in the collection
.orderBy( ) : Collection .orderBy( pathStrings : Text ) : Collection .orderBy( pathObjects : Collection ) : Collection .orderBy( ascOrDesc : Integer ) : Collection returns a new collection containing all elements of the collection in the specified order
.orderByMethod( methodName : Text { ; ...extraParam : expression } ) : Collection returns a new collection containing all elements of the collection in the order defined through the methodName method
.pop() : any removes the last element from the collection and returns it as the function result
.push( element : any { ;...elementN } ) : Collection appends one or more element(s) to the end of the collection instance and returns the edited collection
.query( queryString : Text ; ...value : any ) : Collection .query( queryString : Text ; querySettings : Object ) : Collection returns all elements of a collection of objects that match the search conditions
.reduce( methodName : Text ) : any .reduce( methodName : Text ; initValue : any { ; ...param : expression } ) : any applies the methodName callback method against an accumulator and each element in the collection (from left to right) to reduce it to a single value
.remove( index : Integer { ; howMany : Integer } ) : Collection removes one or more element(s) from the specified index position in the collection and returns the edited collection
.resize( size : Integer { ; defaultValue : any } ) : Collection sets the collection length to the specified new size and returns the resized collection
.reverse( ) : Collection returns a deep copy of the collection with all its elements in reverse order
.shift() : any removes the first element of the collection and returns it as the function result
.slice( startFrom : Integer { ; end : Integer } ) : Collection returns a portion of a collection into a new collection
.some( methodName : Text { ; ...param : any } ) : Boolean .some( startFrom : Integer ; methodName : Text { ; ...param : any } ) : Boolean returns true if at least one element in the collection successfully passed a test
.sort( methodName : Text { ; ...extraParam : any } ) : Collection sorts the elements of the original collection
.sum( { propertyPath : Text } ) : Real returns the sum for all values in the collection instance
.unshift( value : any { ;...valueN : any } ) : Collection inserts the given value(s) at the beginning of the collection

New collection

履歴

バージョン	内容
v16 R4	追加

New collection {( ...value : any )} : Collection

参照	タイプ		説明
value	Number, Text, Date, Time, Boolean, Object, Collection, Picture, Pointer	->	Collection's value(s)
戻り値	コレクション	<-	New collection

説明

The New collection command creates a new empty or prefilled collection and returns its reference.

If you do not pass any parameters, New collection creates an empty collection and returns its reference.

You must assign the returned reference to a 4D variable of the Collection type.

Optionally, you can prefill the new collection by passing one or several value(s) as parameter(s).

Otherwise, you can add or modify elements subsequently through assignment. たとえば:

 myCol[10]:="My new element"

If the new element index is beyond the last existing element of the collection, the collection is automatically resized and all new intermediary elements are assigned a null value.

You can pass any number of values of any supported type (number, text, date, picture, pointer, object, collection...). Unlike arrays, collections can mix data of different types.

You must pay attention to the following conversion issues:

If you pass a pointer, it is kept "as is"; it is evaluated using the JSON Stringify command
Dates are stored as "yyyy-mm-dd" dates or strings with the "YYYY-MM-DDTHH:mm:ss.SSSZ" format, according to the current "dates inside objects" database setting. When converting 4D dates into text prior to storing them in the collection, by default the program takes the local time zone into account. You can modify this behavior using the Dates inside objects selector of the SET DATABASE PARAMETER command.
If you pass a time, it is stored as a number of milliseconds (Real).

例題 1

You want to create a new empty collection and assign it to a 4D collection variable:

 var $myCol : Collection
 $myCol:=New collection
  //$myCol=[]

例題 2

You want to create a prefilled collection:

 var $filledColl : Collection
 $filledColl:=New collection(33;"mike";"november";->myPtr;Current date)
  //$filledColl=[33,"mike","november","->myPtr","2017-03-28T22:00:00.000Z"]

Example 3

You create a new collection and then add a new element:

 var $coll : Collection
 $coll:=New collection("a";"b";"c")
  //$coll=["a","b","c"]
 $coll[9]:="z" //add a 10th element with value "z"
 $vcolSize:=$coll.length //10
  //$coll=["a","b","c",null,null,null,null,null,null,"z"]

New shared collection

履歴

バージョン	内容
v16 R6	追加

New shared collection {( ...value : any )} : Collection

参照	タイプ		説明
value	Number, Text, Date, Time, Boolean, Shared object, Shared collection	->	Shared collection's value(s)
戻り値	コレクション	<-	New shared collection

説明

The New shared collection command creates a new empty or prefilled shared collection and returns its reference.

Adding an element to this collection must be surrounded by the Use...End use structure, otherwise an error is generated. Reading an element without a structure is, however, possible.

If you do not pass any parameters, New shared collection creates an empty shared collection and returns its reference.

You must assign the returned reference to a 4D variable of the Collection type.

Optionally, you can prefill the new shared collection by passing one or several value(s) as parameter(s). Otherwise, you can add or modify elements subsequently through object notation assignment (see example).

If the new element index is beyond the last existing element of the shared collection, the collection is automatically resized and all new intermediary elements are assigned a null value.

You can pass any number of values of the following supported types:

number (real, longint...). Number values are always stored as reals.
text
boolean
date
time (stored as number of milliseconds - real)
null
shared object(*)
shared collection(*)

(*)When a shared object or collection is added to a shared collection, they share the same locking identifier. For more information on this point, refer to the 4D Developer's guide.

例題

 $mySharedCol:=New shared collection("alpha";"omega")
 Use($mySharedCol)
    $mySharedCol[1]:="beta"
 End use

.average()

履歴

バージョン	内容
v16 R6	追加

.average( {propertyPath : Text } ) : Real

参照	タイプ		説明
propertyPath	テキスト	->	Object property path to be used for calculation
戻り値	Real, Undefined	<-	Arithmetic mean (average) of collection values

説明

The .average() function returns the arithmetic mean (average) of defined values in the collection instance.

Only numerical elements are taken into account for the calculation (other element types are ignored).

If the collection contains objects, pass the propertyPath parameter to indicate the object property to take into account.

.average() returns undefined if:

the collection is empty,
the collection does not contain numerical elements,
propertyPath is not found in the collection.

例題 1

 var $col : Collection
 $col:=New collection(10;20;"Monday";True;6)
 $vAvg:=$col.average() //12

例題 2

 var $col : Collection
 $col:=New collection
 $col.push(New object("name";"Smith";"salary";10000))
 $col.push(New object("name";"Wesson";"salary";50000))
 $col.push(New object("name";"Gross";"salary";10500))
 $vAvg:=$col.average("salary") //23500

.clear()

履歴

バージョン	内容
v16 R6	追加

.clear() : Collection

参照	タイプ		説明
戻り値	コレクション	<-	Original collection with all elements removed

説明

The .clear() function removes all elements from the collection instance and returns an empty collection.

例題

var $col : Collection
$col:=New collection(1;2;5)
$col.clear()
$vSize:=$col.length //$vSize=0

.combine()

履歴

バージョン	内容
v16 R6	追加

.combine( col2 : Collection {; index : Integer } ) : Collection

参照	タイプ		説明
col2	コレクション	->	Collection to combine
index	整数	->	Position to which insert elements to combine in collection (default=length+1)
戻り値	コレクション	<-	Original collection containing combined element(s)

説明

The .combine() function inserts col2 elements at the end or at the specified index position in the collection instance and returns the edited collection. Unlike the .insert() function, .combine() adds each value of col2 in the original collection, and not as a single collection element.

By default, col2 elements are added at the end of the orginal collection. You can pass in index the position where you want the col2 elements to be inserted in the collection.

If index > the length of the collection, the actual starting index will be set to the length of the collection.
If index < 0, it is recalculated as index:=index+length (it is considered as the offset from the end of the collection).
If the calculated value is negative, index is set to 0.

例題

var $c; $fruits : Collection
$c:=New collection(1;2;3;4;5;6)
$fruits:=New collection("Orange";"Banana";"Apple";"Grape")
$c.combine($fruits;3) //[1,2,3,"Orange","Banana","Apple","Grape",4,5,6]

.concat()

履歴

バージョン	内容
v16 R6	追加

.concat( value : any { ;...valueN } ) : Collection

参照	タイプ		説明
value	Number, Text, Object, Collection, Date, Time, Boolean, Picture	->	Value(s) to concatenate. If value is a collection, all collection elements are added to the original collection
戻り値	コレクション	<-	New collection with value(s) added to the original collection

説明

The .concat() function returns a new collection containing the elements of the original collection with all elements of the value parameter added to the end.

If value is a collection, all its elements are added as new elements at the end of the original collection. If value is not a collection, it is added itself as a new element.

例題

var $c : Collection
$c:=New collection(1;2;3;4;5)
$fruits:=New collection("Orange";"Banana";"Apple";"Grape")
$fruits.push(New object("Intruder";"Tomato"))
$c2:=$c.concat($fruits) //[1,2,3,4,5,"Orange","Banana","Apple","Grape",{"Intruder":"Tomato"}]
$c2:=$c.concat(6;7;8) //[1,2,3,4,5,6,7,8]

.copy()

履歴

バージョン	内容
v18 R3	New ck shared option. New groupWith parameters
v16 R6	追加

.copy() : Collection
.copy( option : Integer ) : Collection
.copy( option : Integer ; groupWithCol : Collection ) : Collection
.copy( option : Integer ; groupWithObj : Object ) : Collection

参照	タイプ		説明
option	整数	->	`ck resolve pointers`: resolve pointers before copying, `ck shared`: return a shared collection
groupWithCol	コレクション	->	Shared collection to be grouped with the resulting collection
groupWithObj	オブジェクト	->	Shared object to be grouped with the resulting collection
戻り値	コレクション	<-	Deep copy of the original collection

説明

The .copy() function returns a deep copy of the collection instance.Deep copy means that objects or collections within the original collection are duplicated and do not share any reference with the returned collection.

If passed, the option parameter can contain one of the following constants (or both):

option	説明
`ck resolve pointers`	If the original collection contains pointer type values, by default the copy also contains the pointers. However, you can resolve pointers when copying by passing the ck resolve pointers. In this case, each pointer present in the collection is evaluated when copying and its dereferenced value is used.
`ck shared`	By default, copy() returns a regular (not shared) collection, even if the command is applied to a shared collection. Pass the ck shared constant to create a shared collection. In this case, you can use the groupWith parameter to associate the shared collection with another collection or object (see below).

The groupWithCol or groupWithObj parameters allow you to designate a collection or an object with which the resulting collection should be associated.

例題 1

We want to copy the $lastnames regular (non shared) collection into the $sharedObject shared object. To do this, we must create a shared copy of the collection ($sharedLastnames).

var $sharedObject : Object
var $lastnames;$sharedLastnames : Collection
var $text : Text

$sharedObject:=New shared object

$text:=Document to text(Get 4D folder(Current resources folder)+"lastnames.txt")
$lastnames:=JSON Parse($text) //$lastnames is a regular collection

$sharedLastnames:=$lastnames.copy(ck shared) //$sharedLastnames is a shared collection

//Now we can put $sharedLastnames into $sharedObject
Use($sharedObject)
    $sharedObject.lastnames:=$sharedLastnames
End use

例題 2

We want to combine $sharedColl1 and $sharedColl2. Since they belong to different shared groups, a direct combination would result in an error. Therefore, we must make a shared copy of $sharedColl1 and designate $sharedColl2 as a shared group for the copy.

var $sharedColl1;$sharedColl2;$copyColl : Collection

$sharedColl1:=New shared collection(New shared object("lastname";"Smith"))
$sharedColl2:=New shared collection(New shared object("lastname";"Brown"))

//$copyColl belongs to the same shared group as $sharedColl2
 $copyColl:=$sharedColl1.copy(ck shared;$sharedColl2)
 Use($sharedColl2)
    $sharedColl2.combine($copyColl)
 End use

Example 3

We have a regular collection ($lastnames) and we want to put it in the Storage of the application. To do this, we must create a shared copy beforehand ($sharedLastnames).

var $lastnames;$sharedLastnames : Collection
var $text : Text

$text:=Document to text(Get 4D folder(Current resources folder)+"lastnames.txt")
$lastnames:=JSON Parse($text) //$lastnames is a regular collection

$sharedLastnames:=$lastnames.copy(ck shared) // shared copy

Use(Storage)
    Storage.lastnames:=$sharedLastnames
End use

Example 4

This example illustrates the use of the ck resolve pointers option:

 var $col : Collection
 var $p : Pointer
 $p:=->$what

 $col:=New collection
 $col.push(New object("alpha";"Hello";"num";1))
 $col.push(New object("beta";"You";"what";$p))

 $col2:=$col.copy()
 $col2[1].beta:="World!"
 ALERT($col[0].alpha+" "+$col2[1].beta) //displays "Hello World!"

 $what:="You!"
 $col3:=$col2.copy(ck resolve pointers)
 ALERT($col3[0].alpha+" "+$col3[1].what) //displays "Hello You!"

.count()

履歴

バージョン	内容
v16 R6	追加

.count( { propertyPath : Text } ) : Real

参照	タイプ		説明
propertyPath	テキスト	->	Object property path to be used for calculation
戻り値	実数	<-	Number of elements in the collection

説明

The .count() function returns the number of non-null elements in the collection.

If the collection contains objects, you can pass the propertyPath parameter. In this case, only elements that contain the propertyPath are taken into account.

例題

 var $col : Collection
 var $count1;$count2 : Real
 $col:=New collection(20;30;Null;40)
 $col.push(New object("name";"Smith";"salary";10000))
 $col.push(New object("name";"Wesson";"salary";50000))
 $col.push(New object("name";"Gross";"salary";10500))
 $col.push(New object("lastName";"Henry";"salary";12000))
 $count1:=$col.count() //$count1=7
 $count2:=$col.count("name") //$count2=3

.countValues()

履歴

バージョン	内容
v16 R6	追加

.countValues( value : any {; propertyPath : Text } ) : Real

参照	タイプ		説明
value	Text, Number, Boolean, Date, Object, Collection	->	Value to count
propertyPath	テキスト	->	Object property path to be used for calculation
戻り値	実数	<-	Number of occurrences of the value

説明

The .countValues() function returns the number of times value is found in the collection.

You can pass in value:

a scalar value (text, number, boolean, date),
an object or a collection reference.

For an element to be found, the type of value must be equivalent to the type of the element; the method uses the equality operator.

The optional propertyPath parameter allows you to count values inside a collection of objects: pass in propertyPath the path of the property whose values you want to count.

例題 1

 var $col : Collection
 var $vCount : Integer
 $col:=New collection(1;2;5;5;5;3;6;4)
 $vCount:=$col.countValues(5) // $vCount=3

例題 2

 var $col : Collection
 var $vCount : Integer
 $col:=New collection
 $col.push(New object("name";"Smith";"age";5))
 $col.push(New object("name";"Wesson";"age";2))
 $col.push(New object("name";"Jones";"age";3))
 $col.push(New object("name";"Henry";"age";4))
 $col.push(New object("name";"Gross";"age";5))
 $vCount:=$col.countValues(5;"age") //$vCount=2

Example 3

 var $numbers; $letters : Collection
 var $vCount : Integer

 $letters:=New collection("a";"b";"c")
 $numbers:=New collection(1;2;$letters;3;4;5)

 $vCount:=$numbers.countValues($letters) //$vCount=1

.distinct()

履歴

バージョン	内容
v16 R6	追加

.distinct( {option : Integer} ) : Collection
.distinct( propertyPath : Text {; option : Integer } ) : Collection

参照	タイプ		説明
option	整数	->	`ck diacritical`: diacritical evaluation ("A" # "a" for example)
propertyPath	テキスト	->	Path of attribute whose distinct values you want to get
戻り値	コレクション	<-	New collection with only distinct values

説明

The .distinct() function returns a collection containing only distinct (different) values from the original collection.

The returned collection is automatically sorted. Null values are not returned.

By default, a non-diacritical evaluation is performed. If you want the evaluation to be case sensitive or to differentiate accented characters, pass the ck diacritical constant in the option parameter.

If the collection contains objects, you can pass the propertyPath parameter to indicate the object property whose distinct values you want to get.

例題

 var $c; $c2 : Collection
 $c:=New collection
 $c.push("a";"b";"c";"A";"B";"c";"b";"b")
 $c.push(New object("size";1))
 $c.push(New object("size";3))
 $c.push(New object("size";1))
 $c2:=$c.distinct() //$c2=["a","b","c",{"size":1},{"size":3},{"size":1}]
 $c2:=$c.distinct(ck diacritical) //$c2=["a","A","b","B","c",{"size":1},{"size":3},{"size":1}]
 $c2:=$c.distinct("size") //$c2=[1,3]

.equal()

履歴

バージョン	内容
v16 R6	追加

.equal( collection2 : Collection {; option : Integer } ) : Boolean

参照	タイプ		説明
collection2	コレクション	->	Collection to compare
option	整数	->	`ck diacritical`: diacritical evaluation ("A" # "a" for example)
戻り値	ブール	<-	True if collections are identical, false otherwise

説明

The .equal() function compares the collection with collection2 and returns true if they are identical (deep comparison).

例題

 var $c; $c2 : Collection
 var $b : Boolean

 $c:=New collection(New object("a";1;"b";"orange");2;3)
 $c2:=New collection(New object("a";1;"b";"orange");2;3;4)
 $b:=$c.equal($c2) // false

 $c:=New collection(New object("1";"a";"b";"orange");2;3)
 $c2:=New collection(New object("a";1;"b";"orange");2;3)
 $b:=$c.equal($c2) // false

 $c:=New collection(New object("a";1;"b";"orange");2;3)
 $c2:=New collection(New object("a";1;"b";"ORange");2;3)
 $b:=$c.equal($c2) // true

 $c:=New collection(New object("a";1;"b";"orange");2;3)
 $c2:=New collection(New object("a";1;"b";"ORange");2;3)
 $b:=$c.equal($c2;ck diacritical) //false

.every()

履歴

バージョン	内容
v16 R6	追加

.every( methodName : Text { ;...param : any } ) : Boolean
.every( startFrom : Integer ; methodName : Text { ;...param : any } ) : Boolean

参照	タイプ		説明
startFrom	整数	->	Index to start the test at
methodName	テキスト	->	Name of the method to call for the test
param	Mixed	->	Parameter(s) to pass to methodName
戻り値	ブール	<-	True if all elements successfully passed the test

説明

The .every() function returns true if all elements in the collection successfully passed a test implemented in the provided methodName method.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName can perform any test, with or without the parameter(s). This method receives an Object in first parameter ($1) and must set $1.result to true for every element fulfilling the test.

methodName receives the following parameters:

in $1.value: element value to be evaluated
in $2: param
in $N...: paramN...

methodName sets the following parameter(s):

$1.result (Boolean): true if the element value evaluation is successful, false otherwise.
$1.stop (Boolean, optional): true to stop the method callback. The returned value is the last calculated.

In all cases, at the point when the .every() function encounters the first collection element returning false in $1.result, it stops calling methodName and returns false.

By default, .every() tests the whole collection. Optionally, you can pass in startFrom the index of the element from which to start the test.

If startFrom >= the collection's length, false is returned, which means the collection is not tested.
If startFrom < 0, it is considered as the offset from the end of the collection ( startFrom:=startFrom+length).
If startFrom = 0, the whole collection is searched (default).

例題 1

var $c : Collection  
var $b : Boolean
$c:=New collection
$c.push(5;3;1;4;6;2)
$b:=$c.every("NumberGreaterThan0") //returns true
$c.push(-1)
$b:=$c.every("NumberGreaterThan0") //returns false

With the following NumberGreaterThan0 method:

$1.result:=$1.value>0

例題 2

This example tests that all elements of a collection are of the real type:

var $c : Collection
var $b : Boolean
$c:=New collection
$c.push(5;3;1;4;6;2)
$b:=$c.every("TypeLookUp";Is real) //$b=true
$c:=$c.push(New object("name";"Cleveland";"zc";35049))
$c:=$c.push(New object("name";"Blountsville";"zc";35031))
$b:=$c.every("TypeLookUp";Is real) //$b=false

With the following TypeLookUp method:

#DECLARE ($toEval : Object ; $param : Integer) //$1; $2
If(Value type($toEval.value)=$param)
    $toEval.result:=True
End if

.extract()

履歴

バージョン	内容
v16 R6	追加

.extract( propertyPath : Text { ; option : Integer } ) : Collection
.extract( propertyPath : Text ; targetPath : Text { ;...propertyPathN : Text ;... targetPathN : Text } ) : Collection

参照	タイプ		説明
propertyPath	テキスト	->	Object property path whose values must be extracted to the new collection
targetpath	テキスト	->	Target property path or property name
option	整数	->	`ck keep null`: include null properties in the returned collection (ignored by default). Parameter ignored if targetPath passed.
戻り値	コレクション	<-	New collection containing extracted values

説明

The .extract() function creates and returns a new collection containing propertyPath values extracted from the original collection of objects.

The contents of the returned collection depends on the targetPath parameter:

If the targetPath parameter is omitted, .extract() populates the new collection with the propertyPath values of the original collection.

By default, elements for which propertyPath is null or undefined are ignored in the resulting collection. You can pass the ck keep null constant in the option parameter to include these values as null elements in the returned collection.

If one or more targetPath parameter(s) are passed, .extract() populates the new collection with the propertyPath properties and each element of the new collection is an object with targetPath properties filled with the corresponding propertyPath properties. Null values are kept (option parameter is ignored with this syntax).

例題 1

var $c : Collection
$c:=New collection
$c.push(New object("name";"Cleveland"))
$c.push(New object("zip";5321))
$c.push(New object("name";"Blountsville"))
$c.push(42)
$c2:=$c.extract("name") // $c2=[Cleveland,Blountsville]
$c2:=$c.extract("name";ck keep null) //$c2=[Cleveland,null,Blountsville,null]

例題 2

var $c : Collection
$c:=New collection
$c.push(New object("zc";35060))
$c.push(New object("name";Null;"zc";35049))
$c.push(New object("name";"Cleveland";"zc";35049))
$c.push(New object("name";"Blountsville";"zc";35031))
$c.push(New object("name";"Adger";"zc";35006))
$c.push(New object("name";"Clanton";"zc";35046))
$c.push(New object("name";"Clanton";"zc";35045))
$c2:=$c.extract("name";"City") //$c2=[{City:null},{City:Cleveland},{City:Blountsville},{City:Adger},{City:Clanton},{City:Clanton}]
$c2:=$c.extract("name";"City";"zc";"Zip") //$c2=[{Zip:35060},{City:null,Zip:35049},{City:Cleveland,Zip:35049},{City:Blountsville,Zip:35031},{City:Adger,Zip:35006},{City:Clanton,Zip:35046},{City:Clanton,Zip:35045}]

.fill()

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.fill( value : any ) : Collection
.fill( value : any ; startFrom : Integer { ; end : Integer } ) : Collection

参照	タイプ		説明
value	number, Text, Collection, Object, Date, Boolean	->	Filling value
startFrom	整数	->	Start index (included)
end	整数	->	End index (not included)
戻り値	collection	<-	Original collection with filled values

説明

The .fill() function fills the collection with the specified value, optionally from startFrom index to end index, and returns the resulting collection.

If the startFrom parameter is omitted, value is set to all collection elements (startFrom=0).
If the startFrom parameter is passed and end omitted, value is set to collection elements starting at startFrom to the last element of the collection (end=length).
If both the startFrom parameter and end are passed, value is set to collection elements starting at startFrom to the element end.

In case of inconsistency, the following rules apply:

If startFrom < 0, it is recalculated as startFrom:=startFrom+length (it is considered as the offset from the end of the collection). If the calculated value is negative, startFrom is set to 0.
If end < 0 , it is recalculated as end:=end+length.
If end < startFrom (passed or calculated values), the method does nothing.

例題

 var $c : Collection
 $c:=New collection(1;2;3;"Lemon";Null;"";4;5)
 $c.fill("2") // $c:=[2,2,2,2,2,2,2,2]
 $c.fill("Hello";5) // $c=[2,2,2,2,2,Hello,Hello,Hello]
 $c.fill(0;1;5) // $c=[2,0,0,0,0,Hello,Hello,Hello]
 $c.fill("world";1;-5) //-5+8=3 -> $c=[2,"world","world",0,0,Hello,Hello,Hello]

.filter()

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.filter( methodName : Text { ; ...param : any } ) : Collection

参照	タイプ		説明
methodName	テキスト	->	Name of the function to call to filter the collection
param	Mixed	->	Parameter(s) to pass to methodName
戻り値	コレクション	<-	New collection containing filtered elements (shallow copy)

説明

The .filter() function returns a new collection containing all elements of the original collection for which methodName method result is true. This function returns a shallow copy, which means that objects or collections in both collections share the same reference. If the original collection is a shared collection, the returned collection is also a shared collection.

methodName receives the following parameters:

in $1.value: element value to be filtered
in $2: param
in $N...: param2...paramN

methodName sets the following parameter(s):

$1.result (boolean): true if the element value matches the filter condition and must be kept.
$1.stop (boolean, optional): true to stop the method callback. The returned value is the last calculated.

例題 1

You want to get the collection of text elements whose length is smaller than 6:

 var $col;$colNew : Collection
 $col:=New collection("hello";"world";"red horse";66;"tim";"san jose";"miami")
 $colNew:=$col.filter("LengthLessThan";6)
  //$colNew=["hello","world","tim","miami"]

The code for LengthLessThan method is:

 C_OBJECT($1)
 C_LONGINT($2)
 If(Value type($1.value)=Is text)
    $1.result:=(Length($1.value))<$2
 End if

例題 2

You want to filter elements according to their value type:

 var $c;$c2;$c3 : Collection
 $c:=New collection(5;3;1;4;6;2)
 $c.push(New object("name";"Cleveland";"zc";35049))
 $c.push(New object("name";"Blountsville";"zc";35031))
 $c2:=$c.filter("TypeLookUp";Is real) // $c2=[5,3,1,4,6,2]
 $c3:=$c.filter("TypeLookUp";Is object)
  // $c3=[{name:Cleveland,zc:35049},{name:Blountsville,zc:35031}]

The code for TypeLookUp is:

 C_OBJECT($1)
 C_LONGINT($2)
 If(OB Get type($1;"value")=$2)

    $1.result:=True
 End if

.find()

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.find( methodName : Text { ; ...param : any } ) : any
.find( startFrom : Integer ; methodName : Text { ; ...param : any } ) : any

参照	タイプ		説明
startFrom	整数	->	Index to start the search at
methodName	テキスト	->	Name of the function to call for the find
param	any	->	Parameter(s) to pass to methodName
戻り値	any	<-	First value found, or Undefined if not found

説明

The .find() function returns the first value in the collection for which methodName, applied on each element, returns true.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName can perform any test, with or without the parameter(s). This method receives an Object in the first parameter ($1) and must set $1.result to true for the first element fulfilling the condition.

methodName receives the following parameters:

in $1.value: element value to be evaluated
in $2: param
in $N...: param2...paramN

methodName sets the following parameter(s):

$1.result (boolean): true if the element value matches the search condition.
$1.stop (boolean, optional): true to stop the method callback. The returned value is the last calculated.

By default, .find() searches in the whole collection. Optionally, you can pass in startFrom the index of element from which to start the search.

If startFrom >= the collection's length, -1 is returned, which means the collection is not searched.
If startFrom < 0, it is considered as the offset from the end of the collection (startFrom:=startFrom+length). Note: Even if startFrom is negative, the collection is still searched from left to right.
If startFrom = 0, the whole collection is searched (default).

例題 1

You want to get the first element with a length smaller than 5:

 var $col : Collection
 $col:=New collection("hello";"world";4;"red horse";"tim";"san jose")
 $value:=$col.find("LengthLessThan";5) //$value="tim"

The code for LengthLessThan method is:

 var $1 : Object
 var $2 : Integer
 If(Value type($1.value)=Is text)
    $1.result:=(Length($1.value))<$2
 End if

例題 2

You want to find a city name within a collection:

 var $c; $c2 : Collection
 $c:=New collection
 $c.push(New object("name";"Cleveland";"zc";35049))
 $c.push(New object("name";"Blountsville";"zc";35031))
 $c.push(New object("name";"Adger";"zc";35006))
 $c.push(New object("name";"Clanton";"zc";35046))
 $c.push(New object("name";"Clanton";"zc";35045))
 $c2:=$c.find("FindCity";"Clanton") //$c2={name:Clanton,zc:35046}

The code for FindCity is:

 var $1 : Object
 var $2 : Text
 $1.result:=$1.value.name=$2 //name is a property name of objects in the collection

.findIndex()

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.findIndex( methodName : Text { ; ...param : any } ) : Integer
.findIndex( startFrom : Integer ; methodName : Text { ; ...param : any } ) : Integer

参照	タイプ		説明
startFrom	整数	->	Index to start the search at
methodName	テキスト	->	Name of the function to call for the find
param	any	->	Parameter(s) to pass to methodName
戻り値	整数	<-	Index of first value found, or -1 if not found

説明

The .findIndex() function returns the index, in the collection, of the first value for which methodName, applied on each element, returns true.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName can perform any test, using or not the parameter(s). This method receives an Object as first parameter ($1) and must set $1.result to true for the first element fulfilling the condition.

methodName receives the following parameters:

in $1.value: element value to be evaluated
in $2: param
in $N...: param2...paramN

methodName sets the following parameter(s):

$1.result (boolean): true if the element value matches the search condition.
$1.stop (boolean, optional): true to stop the method callback. The returned value is the last calculated.

By default, .findIndex() searches in the whole collection. Optionally, you can pass in startFrom the index of element from which to start the search.

If startFrom >= the collection's length, -1 is returned, which means the collection is not searched.
If startFrom < 0, it is considered as the offset from the end of the collection (startFrom:=startFrom+length). Note: Even if startFrom is negative, the collection is still searched from left to right.
If startFrom = 0, the whole collection is searched (default).

例題

You want to find the position of the first city name within a collection:

 var $c : Collection
 var $val2;$val3 : Integer
 $c:=New collection
 $c.push(New object("name";"Cleveland";"zc";35049))
 $c.push(New object("name";"Blountsville";"zc";35031))
 $c.push(New object("name";"Adger";"zc";35006))
 $c.push(New object("name";"Clanton";"zc";35046))
 $c.push(New object("name";"Clanton";"zc";35045))
 $val2:=$c.findIndex("FindCity";"Clanton") // $val2=3
 $val3:=$c.findIndex($val2+1;"FindCity";"Clanton") //$val3=4

The code for FindCity method is:

 var $1 : Object
 var $2 : Text
 $1.result:=$1.value.name=$2

.indexOf()

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.indexOf( toSearch : expression { ; startFrom : Integer } ) : Integer

参照	タイプ		説明
toSearch	expression	->	Expression to search in the collection
startFrom	整数	->	Index to start the search at
戻り値	整数	<-	Index of the first occurrence of toSearch in the collection, -1 if not found

説明

The .indexOf() function searches the toSearch expression among collection elements and returns the index of the first found occurrence, or -1 if it was not found.

In toSearch, pass the expression to find in the collection. You can pass:

a scalar value (text, number, boolean, date),
the null value,
an object or a collection reference.

toSearch must match exactly the element to find (the same rules as for the equality operator of the data type are applied).

Optionally, you can pass the index of collection from which to start the search in startFrom.

If startFrom >= the collection's length, -1 is returned, which means the collection is not searched.
If startFrom < 0, it is considered as the offset from the end of the collection (startFrom:=startFrom+length). Note: Even if startFrom is negative, the collection is still searched from left to right.
If startFrom = 0, the whole collection is searched (default).

例題

 var $col : Collection
 var $i : Integer
 $col:=New collection(1;2;"Henry";5;3;"Albert";6;4;"Alan";5)
 $i:=$col.indexOf(3) //$i=4
 $i:=$col.indexOf(5;5) //$i=9
 $i:=$col.indexOf("al@") //$i=5
 $i:=$col.indexOf("Hello") //$i=-1

.indices()

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.indices( queryString : Text { ; ...value : any } ) : Collection

参照	タイプ		説明
queryString	テキスト	->	Search criteria
value	any	->	Value(s) to compare when using placeholder(s)
戻り値	コレクション	<-	Element index(es) matching queryString in the collection

説明

The .indices() function works exactly the same as the .query() function but returns indexes, in the original collection, of object collection elements that match the queryString search conditions, and not elements themselves. Indexes are returned in ascending order.

The queryString parameter uses the following syntax:

propertyPath comparator value {logicalOperator propertyPath comparator value}

For a detailed description of the queryString and value parameters, please refer to the dataClass.query() function.

例題

 var $c; $icol : Collection
 $c:=New collection
 $c.push(New object("name";"Cleveland";"zc";35049))
 $c.push(New object("name";"Blountsville";"zc";35031))

 $c.push(New object("name";"Adger";"zc";35006))
 $c.push(New object("name";"Clanton";"zc";35046))
 $c.push(New object("name";"Clanton";"zc";35045))
 $icol:=$c.indices("name = :1";"Cleveland") // $icol=[0]
 $icol:=$c.indices("zc > 35040") // $icol=[0,3,4]

.insert()

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.insert( index : Integer ; element : any ) : Collection

参照	タイプ		説明
index	整数	->	Where to insert the element
element	any	->	Element to insert in the collection
戻り値	コレクション	<-	Original collection containing inserted element

説明

The .insert() function inserts element at the specified index position in the collection instance and returns the edited collection.

In index, pass the position where you want the element to be inserted in the collection.

If index > the length of the collection, actual starting index will be set to the length of the collection.
If index <0, it is recalculated as index:=index+length (it is considered as the offset from the end of the collection).
If the calculated value is negative, index is set to 0.

Any type of element accepted by a collection can be inserted, even another collection.

例題

 var $col : Collection
 $col:=New collection("a";"b";"c";"d") //$col=["a","b","c","d"]
 $col.insert(2;"X") //$col=["a","b","X","c","d"]
 $col.insert(-2;"Y") //$col=["a","b","X","Y","c","d"]
 $col.insert(-10;"Hi") //$col=["Hi","a","b","X","Y","c","d"]

.join()

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.join( delimiter : Text { ; option : Integer } ) : Text

参照	タイプ		説明
delimiter	テキスト	->	Separator to use between elements
option	整数	->	`ck ignore null or empty`: ignore null and empty strings in the result
戻り値	テキスト	<-	String containing all elements of the collection, separated by delimiter

説明

The .join() function converts all elements of the collection to strings and concatenates them using the specified delimiter string as separator.The function returns the resulting string.

By default, null or empty elements of the collection are returned in the resulting string. Pass the ck ignore null or empty constant in the option parameter if you want to remove them from the resulting string.

例題

 var $c : Collection
 var $t1;$t2 : Text
 $c:=New collection(1;2;3;"Paris";Null;"";4;5)
 $t1:=$c.join("|") //1|2|3|Paris|null||4|5
 $t2:=$c.join("|";ck ignore null or empty) //1|2|3|Paris|4|5

.lastIndexOf()

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.lastIndexOf( toSearch : expression { ; startFrom : Integer } ) : Integer

参照	タイプ		説明
toSearch	expression	->	The element that is to be searched for within the collection
startFrom	整数	->	Index to start the search at
戻り値	整数	<-	Index of last occurrence of toSearch in the collection, -1 if not found

説明

The .lastIndexOf() function searches the toSearch expression among collection elements and returns the index of the last occurrence, or -1 if it was not found.

In toSearch, pass the expression to find in the collection. You can pass:

a scalar value (text, number, boolean, date),
the null value,
an object or a collection reference.

toSearch must match exactly the element to find (the same rules as for the equality operator are applied).

Optionally, you can pass the index of collection from which to start a reverse search in startFrom.

If startFrom >= the collection's length minus one (coll.length-1), the whole collection is searched (default).
If startFrom < 0, it is recalculated as startFrom:=startFrom+length (it is considered as the offset from the end of the collection). If the calculated value is negative, -1 is returned (the collection is not searched). Note: Even if startFrom is negative, the collection is still searched from right to left.
If startFrom = 0, -1 is returned, which means the collection is not searched.

例題

 var $col : Collection
 var $pos1;$pos2;$pos3;$pos4;$pos5 : Integer 
 $col:=Split string("a,b,c,d,e,f,g,h,i,j,e,k,e";",") //$col.length=13
 $pos1:=$col.lastIndexOf("e") //returns 12
 $pos2:=$col.lastIndexOf("e";6) //returns 4
 $pos3:=$col.lastIndexOf("e";15) //returns 12
 $pos4:=$col.lastIndexOf("e";-2) //returns 10
 $pos5:=$col.lastIndexOf("x") //returns -1

.length

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.length : Integer

説明

The .length property returns the number of elements in the collection.

The .length property is initialized when the collection is created. Adding or removing elements updates the length, if necessary. This property is read-only (you cannot use it to set the size of the collection).

例題

 var $col : Collection //$col.length initialized to 0
 $col:=New collection("one";"two";"three") //$col.length updated to 3
 $col[4]:="five" //$col.length updated to 5
 $vSize:=$col.remove(0;3).length //$vSize=2

.map()

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.map( methodName : Text { ; ...param : any } ) : Collection

参照	タイプ		説明
methodName	テキスト	->	Name of method used to transform the collection elements
param	any	->	Parameter(s) for the method
戻り値	コレクション	<-	Collection of transformed values

説明

The .map() function creates a new collection based upon the result of the call of the methodName method on each element of the original collection. Optionally, you can pass parameters to methodName using the param parameter(s). .map() always returns a collection with the same size as the original collection.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName can perform any operation, with or without the parameter(s).

methodName receives the following parameters:

in $1.value (any type): element value to be mapped
in $2 (any type): param
in $N... (any type): paramN...

methodName sets the following parameter(s):

$1.result (any type): new transformed value to add to the resulting collection
$1.stop (boolean): true to stop the method callback. The returned value is the last calculated.

例題

 var $c; $c2 : Collection
 $c:=New collection(1;4;9;10;20)
 $c2:=$c.map("Percentage";$c.sum())
  //$c2=[2.27,9.09,20.45,22.73,45.45]

Here is the Percentage method:

 var $1 : Object
 var $2 : Real
 $1.result:=Round(($1.value/$2)*100;2)

.max()

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.max( { propertyPath : Text } ) : any

参照	タイプ		説明
propertyPath	テキスト	->	Object property path to be used for evaluation
戻り値	Boolean, Text, Number, Collection, Object, Date	<-	Maximum value in the collection

説明

The .max() function returns the element with the highest value in the collection (the last element of the collection as it would be sorted in ascending order using the .sort() function).

If the collection contains different types of values, the .max() function will return the maximum value within the last element type in the type list order (see .sort() description).

If the collection contains objects, pass the propertyPath parameter to indicate the object property whose maximum value you want to get.

If the collection is empty, .max() returns Undefined.

例題

 var $col : Collection
 $col:=New collection(200;150;55)
 $col.push(New object("name";"Smith";"salary";10000))
 $col.push(New object("name";"Wesson";"salary";50000))
 $col.push(New object("name";"Alabama";"salary";10500))
 $max:=$col.max() //{name:Alabama,salary:10500}
 $maxSal:=$col.max("salary") //50000
 $maxName:=$col.max("name") //"Wesson"

.min()

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.min( { propertyPath : Text } ) : any

参照	タイプ		説明
propertyPath	テキスト	->	Object property path to be used for evaluation
戻り値	Boolean, Text, Number, Collection, Object, Date	<-	Minimum value in the collection

説明

The .min() function returns the element with the smallest value in the collection (the first element of the collection as it would be sorted in ascending order using the .sort() function).

If the collection contains different types of values, the .min() function will return the minimum value within the first element type in the type list order (see .sort() description).

If the collection contains objects, pass the propertyPath parameter to indicate the object property whose minimum value you want to get.

If the collection is empty, .min() returns Undefined.

例題

 var $col : Collection
 $col:=New collection(200;150;55)
 $col.push(New object("name";"Smith";"salary";10000))
 $col.push(New object("name";"Wesson";"salary";50000))
 $col.push(New object("name";"Alabama";"salary";10500))
 $min:=$col.min() //55
 $minSal:=$col.min("salary") //10000
 $minName:=$col.min("name") //"Alabama"

.orderBy()

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バージョン	内容
v16 R6	追加

.orderBy( ) : Collection
.orderBy( pathStrings : Text ) : Collection
.orderBy( pathObjects : Collection ) : Collection
.orderBy( ascOrDesc : Integer ) : Collection

参照	タイプ		説明
pathStrings	テキスト	->	Property path(s) on which to order the collection
pathObjects	コレクション	->	Collection of criteria objects
ascOrDesc	整数	->	`ck ascending` or `ck descending` (scalar values)
戻り値	コレクション	<-	Ordered copy of the collection (shallow copy)

説明

The .orderBy() function returns a new collection containing all elements of the collection in the specified order.

This function returns a shallow copy, which means that objects or collections in both collections share the same reference. If the original collection is a shared collection, the returned collection is also a shared collection.

If you pass no parameter, the function orders scalar values in the collection in ascending order (other element types such as objects or collections are returned unordered). You can modify this automatic order by passing the ck ascending or ck descending constants in the ascOrDesc parameter (see below).

You can also pass a criteria parameter to define how the collection elements must be sorted. Three syntaxes are supported for this parameter:

pathStrings : Text (formula). Syntax: propertyPath1 {desc or asc}, propertyPath2 {desc or asc},... (default order: asc). pathStrings contains a formula made of 1 to x property paths and (optionally) sort orders, separated by commas. The order in which the properties are passed determines the sorting priority of the collection elements. By default, properties are sorted in ascending order. You can set the sort order of a property in the criteria string, separated from the property path by a single space: pass "asc" to sort in ascending order or "desc" in descending order.
pathObjects : Collection. You can add as many objects in the pathObjects collection as necessary. By default, properties are sorted in ascending order ("descending" is false). Each element of the collection contains an object structured in the following way:

    {"*propertyPath*": string,
    "*descending*": boolean}

ascOrDesc : Integer. You pass one of the following constants from the Objects and collections theme:

定数タイプ結果説明

ck ascending 倍長整数 0 Elements are ordered in ascending order (default)

ck descending 倍長整数 1 Elements are ordered in descending order

This syntax orders scalar values in the collection only (other element types such as objects or collections are returned unordered).

If the collection contains elements of different types, they are first grouped by type and sorted afterwards. Types are returned in the following order:

null
booleans
strings
numbers
objects
collections
dates

例題 1

Ordering a collection of numbers in ascending and descending order:

 var $c; $c2; $3 : Collection 
 $c:=New collection
 For($vCounter;1;10)
    $c.push(Random)
 End for
 $c2:=$c.orderBy(ck ascending)
 $c3:=$c.orderBy(ck descending)

例題 2

Ordering a collection of objects based on a text formula with property names:

 var $c; $c2 : Collection
 $c:=New collection
 For($vCounter;1;10)
    $c.push(New object("id";$vCounter;"value";Random))
 End for
 $c2:=$c.orderBy("value desc")
 $c2:=$c.orderBy("value desc, id")
 $c2:=$c.orderBy("value desc, id asc")

Ordering a collection of objects with a property path:

 var $c; $c2 : Collection
 $c:=New collection
 $c.push(New object("name";"Cleveland";"phones";New object("p1";"01";"p2";"02")))
 $c.push(New object("name";"Blountsville";"phones";New object("p1";"00";"p2";"03")))

 $c2:=$c.orderBy("phones.p1 asc")

Example 3

Ordering a collection of objects using a collection of criteria objects:

 var $crit; $c; $c2 : COllection
 $crit:=New collection
 $c:=New collection
 For($vCounter;1;10)
    $c.push(New object("id";$vCounter;"value";Random))
 End for
 $crit.push(New object("propertyPath";"value";"descending";True))
 $crit.push(New object("propertyPath";"id";"descending";False))
 $c2:=$c.orderBy($crit)

Ordering with a property path:

 var $crit; $c; $c2 : Collection
 $c:=New collection
 $c.push(New object("name";"Cleveland";"phones";New object("p1";"01";"p2";"02")))
 $c.push(New object("name";"Blountsville";"phones";New object("p1";"00";"p2";"03")))
 $crit:=New collection(New object("propertyPath";"phones.p2";"descending";True))
 $c2:=$c.orderBy($crit)

.orderByMethod()

履歴

バージョン	内容
v16 R6	追加

.orderByMethod( methodName : Text { ; ...extraParam : expression } ) : Collection

参照	タイプ		説明
methodName	テキスト	->	Name of method used to specify the sorting order
extraParam	expression	->	Parameter(s) for the method
戻り値	コレクション	<-	Sorted copy of the collection (shallow copy)

説明

The .orderByMethod() function returns a new collection containing all elements of the collection in the order defined through the methodName method.

In methodName, pass a comparison method that compares two values and returns true in $1.result if the first value is lower than the second value. You can provide additional parameters to methodName if necessary.

methodName will receive the following parameters:
- $1 (object), where:
  - $1.value (any type): first element value to be compared
  - $1.value2 (any type): second element value to be compared
- $2...$N (any type): extra parameters
methodName sets the following parameter:
- $1.result (boolean): true if $1.value < $1.value2, false otherwise

例題 1

You want to sort a collection of strings in numerical order rather than alphabetical order:

 var $c; $c2; $c3 : Collection
 $c:=New collection
 $c.push("33";"4";"1111";"222")
 $c2:=$c.orderBy() //$c2=["1111","222","33","4"], alphabetical order
 $c3:=$c.orderByMethod("NumAscending") // $c3=["4","33","222","1111"]

Here is the code for NumAscending:

 $1.result:=Num($1.value)<Num($1.value2)

例題 2

You want to sort a collection of strings on their length:

 var $fruits; $c2 : Collection
 $fruits:=New collection("Orange";"Apple";"Grape";"pear";"Banana";"fig";"Blackberry";"Passion fruit")
 $c2:=$fruits.orderByMethod("WordLength")
  //$c2=[Passion fruit,Blackberry,Orange,Banana,Apple,Grape,pear,fig]

Here is the code for WordLength:

 $1.result:=Length(String($1.value))>Length(String($1.value2))

Example 3

You want to sort a collection by character code or language:

var $strings1; $strings2 : Collection
$strings1:=New collection("Alpha";"Charlie";"alpha";"bravo";"Bravo";"charlie")

//using the character code:
$strings2:=$strings1.orderByMethod("sortCollection";sk character codes)
// result : ["Alpha","Bravo","Charlie","alpha","bravo","charlie"]

//using the language:
$strings2:=$string1s.orderByMethod("sortCollection";sk strict)
// result : ["alpha","Alpha","bravo","Bravo","charlie","Charlie"]

The sortCollection method:

var$1Object
var$2Integer // sort option

$1.result:=(Compare strings($1.value;$1.value2;$2)<0)

.pop()

履歴

バージョン	内容
v16 R6	追加

.pop() : any

参照	タイプ		説明
戻り値	any	<-	Last element of collection

説明

The .pop() function removes the last element from the collection and returns it as the function result.

When applied to an empty collection, .pop() returns undefined.

例題

.pop(), used in conjunction with .push(), can be used to implement a first-in, last-out stack feature:

 var $stack : Collection
 $stack:=New collection //$stack=[]
 $stack.push(1;2) //$stack=[1,2]
 $stack.pop() //$stack=[1]  Returns 2
 $stack.push(New collection(4;5)) //$stack=[[1,[4,5]]
 $stack.pop() //$stack=[1]  Returns [4,5]
 $stack.pop() //$stack=[]  Returns 1

.push()

履歴

バージョン	内容
v16 R6	追加

.push( element : any { ;...elementN } ) : Collection

参照	タイプ		説明
element	Mixed	->	Element(s) to add to the collection
戻り値	コレクション	<-	Original collection containing added elements

説明

The .push() function appends one or more element(s) to the end of the collection instance and returns the edited collection.

例題 1

 var $col : Collection
 $col:=New collection(1;2) //$col=[1,2]
 $col.push(3) //$col=[1,2,3]
 $col.push(6;New object("firstname";"John";"lastname";"Smith"))
  //$col=[1,2,3,6,{firstname:John,lastname:Smith}

例題 2

You want to sort the resutling collection:

 var $col; $sortedCol : Collection
 $col:=New collection(5;3;9) //$col=[5,3,9]
 $sortedCol:=$col.push(7;50).sort()
  //$col=[5,3,9,7,50]
  //$sortedCol=[3,5,7,9,50]

.query()

履歴

バージョン	内容
v17 R5	Support of querySettings
v16 R6	追加

.query( queryString : Text ; ...value : any ) : Collection
.query( queryString : Text ; querySettings : Object ) : Collection

参照	タイプ		説明
queryString	テキスト	->	Search criteria
value	Mixed	->	Value(s) to compare when using placeholder(s)
querySettings	オブジェクト	->	Query options: parameters, attributes
戻り値	コレクション	<-	Element(s) matching queryString in the collection

説明

The .query() function returns all elements of a collection of objects that match the search conditions defined by queryString and (optionally) value or querySettings. If the original collection is a shared collection, the returned collection is also a shared collection.

The queryString parameter uses the following syntax:

propertyPath comparator value {logicalOperator propertyPath comparator value}

For detailed information on how to build a query using , value and querySettings parameters, please refer to the dataClass .query() function description.

例題 1

 var $c; $c2; $c3 : Collection
 $c:=New collection
 $c.push(New object("name";"Cleveland";"zc";35049))
 $c.push(New object("name";"Blountsville";"zc";35031))
 $c.push(New object("name";"Adger";"zc";35006))
 $c.push(New object("name";"Clanton";"zc";35046))
 $c.push(New object("name";"Clanton";"zc";35045))
 $c2:=$c.query("name = :1";"Cleveland") //$c2=[{name:Cleveland,zc:35049}]
 $c3:=$c.query("zc > 35040") //$c3=[{name:Cleveland,zc:35049},{name:Clanton,zc:35046},{name:Clanton,zc:35045}]

例題 2

 var $c : Collection
 $c:=New collection
 $c.push(New object("name";"Smith";"dateHired";!22-05-2002!;"age";45))
 $c.push(New object("name";"Wesson";"dateHired";!30-11-2017!))
 $c.push(New object("name";"Winch";"dateHired";!16-05-2018!;"age";36))

 $c.push(New object("name";"Sterling";"dateHired";!10-5-1999!;"age";Null))
 $c.push(New object("name";"Mark";"dateHired";!01-01-2002!))

This example returns persons whose name contains "in":

 $col:=$c.query("name = :1";"@in@")
  //$col=[{name:Winch...},{name:Sterling...}]

This example returns persons whose name does not begin with a string from a variable (entered by the user, for example):

 $col:=$c.query("name # :1";$aString+"@")
  //if $astring="W"
  //$col=[{name:Smith...},{name:Sterling...},{name:Mark...}]

This example returns persons whose age is not known (property set to null or undefined):

 $col:=$c.query("age=null") //placeholders not allowed with "null"
  //$col=[{name:Wesson...},{name:Sterling...},{name:Mark...}]

This example returns persons hired more than 90 days ago:

 $col:=$c.query("dateHired < :1";(Current date-90))
  //$col=[{name:Smith...},{name:Sterling...},{name:Mark...}] if today is 01/10/2018

Example 3

More examples of queries can be found in the dataClass.query() page.

.reduce()

履歴

バージョン	内容
v16 R6	追加

.reduce( methodName : Text ) : any
.reduce( methodName : Text ; initValue : any { ; ...param : expression } ) : any

参照	タイプ		説明
methodName	テキスト	->	Name of the function to call to process collection elements
initValue	Text, Number, Object, Collection, Date, Boolean	->	Value to use as the first argument to the first call of methodName
param	expression	->	Parameter(s) to pass to methodName
戻り値	Text, Number, Object, Collection, Date, Boolean	<-	Result of the accumulator value

説明

The .reduce() function applies the methodName callback method against an accumulator and each element in the collection (from left to right) to reduce it to a single value.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName takes each collection element and performs any desired operation to accumulate the result into $1.accumulator, which is returned in $1.value.

You can pass the value to initialize the accumulator in initValue. If omitted, $1.accumulator starts with Undefined.

methodName receives the following parameters:

in $1.value: element value to be processed
in $2: param
in $N...: paramN...

methodName sets the following parameter(s):

$1.accumulator: value to be modified by the function and which is initialized by initValue.
$1.stop (boolean, optional): true to stop the method callback. The returned value is the last calculated.

例題 1

 C_COLLECTION($c)
 $c:=New collection(5;3;5;1;3;4;4;6;2;2)
 $r:=$c.reduce("Multiply";1) //returns 86400

With the following Multiply method:

 If(Value type($1.value)=Is real)
    $1.accumulator:=$1.accumulator*$1.value
 End if

例題

This example allows reducing several collection elements to a single one:

 var $c;$r : Collection
 $c:=New collection
 $c.push(New collection(0;1))
 $c.push(New collection(2;3))
 $c.push(New collection(4;5))
 $c.push(New collection(6;7))
 $r:=$c.reduce("Flatten") //$r=[0,1,2,3,4,5,6,7]

With the following Flatten method:

 If($1.accumulator=Null)
    $1.accumulator:=New collection
 End if
 $1.accumulator.combine($1.value)

.remove()

履歴

バージョン	内容
v16 R6	追加

.remove( index : Integer { ; howMany : Integer } ) : Collection

参照	タイプ		説明
index	整数	->	Element at which to start removal
howMany	整数	->	Number of elements to remove, or 1 element if omitted
戻り値	コレクション	<-	Original collection without removed element(s)

説明

The .remove() function removes one or more element(s) from the specified index position in the collection and returns the edited collection.

In index, pass the position where you want the element to be removed from the collection.

If index < 0, it is recalculated as index:=index+length (it is considered as the offset from the end of the collection).
If the calculated value < 0, index is set to 0.
If the calculated value > the length of the collection, index is set to the length.

In howMany, pass the number of elements to remove from index. If howMany is not specified, then one element is removed.

If you try to remove an element from an empty collection, the method does nothing (no error is generated).

例題

 var $col : Collection
 $col:=New collection("a";"b";"c";"d";"e";"f";"g";"h")
 $col.remove(3) // $col=["a","b","c","e","f","g","h"]
 $col.remove(3;2) // $col=["a","b","c","g","h"]
 $col.remove(-8;1) // $col=["b","c","g","h"]
 $col.remove(-3;1) // $col=["b","g","h"]

.resize()

履歴

バージョン	内容
v16 R6	追加

.resize( size : Integer { ; defaultValue : any } ) : Collection

参照	タイプ		説明
size	整数	->	New size of the collection
defaultValue	Number, Text, Object, Collection, Date, Boolean	->	Default value to fill new elements
戻り値	コレクション	<-	Resized original collection

説明

The .resize() function sets the collection length to the specified new size and returns the resized collection.

If size < collection length, exceeding elements are removed from the collection.
If size > collection length, the collection length is increased to size.

By default, new elements are filled will null values. You can specify the value to fill in added elements using the defaultValue parameter.

例題

 var $c : Collection
 $c:=New collection
 $c.resize(10) // $c=[null,null,null,null,null,null,null,null,null,null]

 $c:=New collection
 $c.resize(10;0) // $c=[0,0,0,0,0,0,0,0,0,0]

 $c:=New collection(1;2;3;4;5)
 $c.resize(10;New object("name";"X")) //$c=[1,2,3,4,5,{name:X},{name:X},{name:X},{name:X},{name:X}]

 $c:=New collection(1;2;3;4;5)
 $c.resize(2) //$c=[1,2]

.reverse()

履歴

バージョン	内容
v16 R6	追加

.reverse( ) : Collection

参照	タイプ		説明
戻り値	コレクション	<-	Inverted copy of the collection

説明

The .reverse() function returns a deep copy of the collection with all its elements in reverse order. If the original collection is a shared collection, the returned collection is also a shared collection.

例題

 var $c; $c2 : Collection
 $c:=New collection(1;3;5;2;4;6)
 $c2:=$c.reverse() //$c2=[6,4,2,5,3,1]

.shift()

履歴

バージョン	内容
v16 R6	追加

.shift() : any

参照	タイプ		説明
戻り値	any	<-	First element of collection

説明

The .shift() function removes the first element of the collection and returns it as the function result.

If the collection is empty, this method does nothing.

例題

 var $c : Collection
 var $val : Variant
 $c:=New collection(1;2;4;5;6;7;8)
 $val:=$c.shift()
  // $val=1
  // $c=[2,4,5,6,7,8]

.slice()

履歴

バージョン	内容
v16 R6	追加

.slice( startFrom : Integer { ; end : Integer } ) : Collection

参照	タイプ		説明
startFrom	整数	->	Index to start the search at (included)
end	整数	->	End index (not included)
戻り値	コレクション	<-	New collection containing sliced elements (shallow copy)

説明

The .slice() function returns a portion of a collection into a new collection, selected from startFrom index to end index (end not included). This function returns a shallow copy of the collection. If the original collection is a shared collection, the returned collection is also a shared collection.

The returned collection contains the element specified by startFrom and all subsequent elements up to, but not including, the element specified by end. If only the startFrom parameter is specified, the returned collection contains all elements from startFrom to the last element of the original collection.

If startFrom < 0, it is recalculated as startFrom:=startFrom+length (it is considered as the offset from the end of the collection).
If the calculated value < 0, startFrom is set to 0.
If end < 0 , it is recalculated as end:=end+length.
If end < startFrom (passed or calculated values), the method does nothing.

例題

 var $c; $nc : Collection
 $c:=New collection(1;2;3;4;5)
 $nc:=$c.slice(0;3) //$nc=[1,2,3]
 $nc:=$c.slice(3) //$nc=[4,5]
 $nc:=$c.slice(1;-1) //$nc=[2,3,4]
 $nc:=$c.slice(-3;-2) //$nc=[3]

.some()

履歴

バージョン	内容
v16 R6	追加

.some( methodName : Text { ; ...param : any } ) : Boolean
.some( startFrom : Integer ; methodName : Text { ; ...param : any } ) : Boolean

参照	タイプ		説明
startFrom	整数	->	Index to start the test at
methodName	テキスト	->	Name of the method to call for the test
param	Mixed	->	Parameter(s) to pass to methodName
戻り値	ブール	<-	True if at least one element successfully passed the test

説明

The .some() function returns true if at least one element in the collection successfully passed a test implemented in the provided methodName method.

In methodName, pass the name of the method to use to evaluate collection elements, along with its parameter(s) in param (optional). methodName can perform any test, with or without the parameter(s). This method receives an Object as first parameter ($1) and must set $1.result to True for every element fulfilling the test.

methodName receives the following parameters:

in $1.value: element value to be evaluated
in $2: param
in $N...: param2...paramN

methodName sets the following parameter(s):

$1.result (boolean): true if the element value evaluation is successful, false otherwise.
$1.stop (boolean, optional): true to stop the method callback. The returned value is the last calculated.

In any case, at the point where .some() function encounters the first collection element returning true in $1.result, it stops calling methodName and returns true.

By default, .some() tests the whole collection. Optionally, you can pass the index of an element from which to start the test in startFrom.

If startFrom >= the collection's length, False is returned, which means the collection is not tested.
If startFrom < 0, it is considered as the offset from the end of the collection.
If startFrom = 0, the whole collection is searched (default).

例題

 var $c : Collection
 var $b : Boolean
 $c:=New collection
 $c.push(-5;-3;-1;-4;-6;-2)
 $b:=$c.some("NumberGreaterThan0") // returns false
 $c.push(1)
 $b:=$c.some("NumberGreaterThan0") // returns true

 $c:=New collection
 $c.push(1;-5;-3;-1;-4;-6;-2)
 $b:=$c.some("NumberGreaterThan0") //$b=true
 $b:=$c.some(1;"NumberGreaterThan0") //$b=false

With the following NumberGreaterThan0 method:

 $1.result:=$1.value>0

.sort()

履歴

バージョン	内容
v16 R6	追加

.sort( methodName : Text { ; ...extraParam : any } ) : Collection

参照	タイプ		説明
methodName	テキスト	->	Name of method used to specify the sorting order
extraParam	any	->	Parameter(s) for the method
戻り値	コレクション	<-	Original collection sorted

説明

The .sort() function sorts the elements of the original collection and also returns the sorted collection.

If .sort() is called with no parameters, only scalar values (number, text, date, booleans) are sorted. Elements are sorted by default in ascending order, according to their type.

If you want to sort the collection elements in some other order or sort any type of element, you must supply in methodName a comparison method that compares two values and returns true in $1.result if the first value is lower than the second value. You can provide additional parameters to methodName if necessary.

methodName will receive the following parameters:
- $1 (object), where:
  - $1.value (any type): first element value to be compared
  - $1.value2 (any type): second element value to be compared
- $2...$N (any type): extra parameters

methodName sets the following parameter: * $1.result (boolean): true if $1.value < $1.value2, false otherwise

If the collection contains elements of different types, they are first grouped by type and sorted afterwards. Types are returned in the following order:

null
booleans
strings
numbers
objects
collections
dates

例題 1

 var $col; $col2 : Collection
 $col:=New collection("Tom";5;"Mary";3;"Henry";1;"Jane";4;"Artie";6;"Chip";2)
 $col2:=$col.sort() // $col2=["Artie","Chip","Henry","Jane","Mary","Tom",1,2,3,4,5,6]
  // $col=["Artie","Chip","Henry","Jane","Mary","Tom",1,2,3,4,5,6]

例題 2

 var $col; $col2 : Collection
 $col:=New collection(10;20)
 $col2:=$col.push(5;3;1;4;6;2).sort() //$col2=[1,2,3,4,5,6,10,20]

Example 3

 var $col; $col2; $col3 : Collection
 $col:=New collection(33;4;66;1111;222)
 $col2:=$col.sort() //numerical sort: [4,33,66,222,1111]
 $col3:=$col.sort("numberOrder") //alphabetical sort: [1111,222,33,4,66]

  //numberOrder project method
 var $1 : Object
 $1.result:=String($1.value)<String($1.value2)

.sum()

履歴

バージョン	内容
v16 R6	追加

.sum( { propertyPath : Text } ) : Real

参照	タイプ		説明
propertyPath	テキスト	->	Object property path to be used for calculation
戻り値	実数	<-	Sum of collection values

説明

The .sum() function returns the sum for all values in the collection instance.

Only numerical elements are taken into account for the calculation (other element types are ignored).

If the collection contains objects, pass the propertyPath parameter to indicate the object property to take into account.

.sum() returns 0 if:

the collection is empty,
the collection does not contain numerical elements,
propertyPath is not found in the collection.

例題 1

 var $col : Collection
 var $vSum : Real
 $col:=New collection(10;20;"Monday";True;2)
 $vSum:=$col.sum() //32

例題 2

 var $col : Collection
 var $vSum : Real
 $col:=New collection
 $col.push(New object("name";"Smith";"salary";10000))
 $col.push(New object("name";"Wesson";"salary";50000))
 $col.push(New object("name";"Gross";"salary";10500,5))
 $vSum:=$col.sum("salary") //$vSum=70500,5

.unshift()

履歴

バージョン	内容
v16 R6	追加

.unshift( value : any { ;...valueN : any } ) : Collection

参照	タイプ		説明
value	Text, Number, Object, Collection, Date	->	Value(s) to insert at the beginning of the collection
戻り値	実数	<-	Collection containing added element(s)

説明

The .unshift() function inserts the given value(s) at the beginning of the collection and returns the modified collection.

If several values are passed, they are inserted all at once, which means that they appear in the resulting collection in the same order as in the argument list.

例題

 var $c : Collection
 $c:=New collection(1;2)
 $c.unshift(4) // $c=[4,1,2]
 $c.unshift(5) //$c=[5,4,1,2]
 $c.unshift(6;7) // $c=[6,7,5,4,1,2]

定数	タイプ	結果	説明
ck ascending	倍長整数	0	Elements are ordered in ascending order (default)
ck descending	倍長整数	1	Elements are ordered in descending order