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Version: 4.x

IF operator

The IF operator - creating a property implementing selection of a value by condition (single form).

Syntax​

result IF condition

Description​

The IF operator creates a property that returns the given value when a certain condition is met. If the condition is not met, the property returns NULL.

Parameters​

  • result

    Expression whose value defines the result.

  • condition

    An expression whose value defines the condition.

Examples​

name = DATA STRING[100] (Book);
hasName (Book b) = TRUE IF name(b);

background (Book b) = RGB(224, 255, 128) IF b IS Book;

countTags (Book b) = GROUP SUM 1 IF in(b, Tag t);