Documentation:OCLOperators isEmpty: Difference between revisions

OCLOperators isEmpty

Revision as of 07:19, 3 March 2023

isEmpty () : Boolean

Returns true if self is empty - otherwise, returns false.

Expression	Result
Sequence{2, 'a'}->isEmpty()	false
Sequence{null}->isEmpty()	false
Sequence{}->isEmpty()	true

Warning!

Never use ->isEmpty on a value type. The value will be converted to a list (with the value as its only item) and that will always evaluate as False.

@@ Line 1: / Line 1: @@
 === isEmpty () : Boolean ===
-Returns true if ''self'' is empty, false otherwise.
+Returns true if ''self'' is empty - otherwise, returns false.
 {| class="wikitable"
 !Expression
@@ Line 16: / Line 16: @@
 ===== Warning! =====
-Never use ->isEmpty on a value type. The value will be converted to a list (with the value as it's only item) and that will always evaluate to False.
+''Never'' use ->isEmpty on a value type. The value will be converted to a list (with the value as its only item) and that will always evaluate as False.
 See also: [[OCLOperators notEmpty]]
 [[Category:OCLOperators]]