About class functions

This section describes the built-in 4D class functions as well as the associated constructor commands. 4D class functions and properties are available through class instance objects.

• functions must be called on instances with the () operator. For example, collection.sort().
• properties are accessed without parentheses, for example file.creationTime. You can also use the [] syntax, for example file["creationTime"].
• commands can be called independantly, with or without parameters. For example Folder(fk database folder).

Writing conventions

The following conventions are used in the function syntax:

• the { } characters (braces) indicate optional parameters. For example, .delete( { option : Integer } ) means that the option parameter may be omitted when calling the function.
• the { ; ...param } notation indicates an unlimited number of parameters. For example, .concat( value : any { ;...valueN } ) : Collection means that an unlimited number of values of any type can be passed to the function.
• the any keyword is used for parameters that can be of any type that can be stored within attributes (number, text, boolean, date, time, object, collection...).

See also

Classes in the 4D Language.