Documentation:OCLOperators isEmpty: Difference between revisions

OCLOperators isEmpty

Latest revision as of 05:01, 12 February 2025

This page was created by Alexandra on 2017-08-13. Last edited by Stephanie@mdriven.net on 2025-02-12.

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.

See also: OCLOperators notEmpty

@@ Line 17: / Line 17: @@
 ===== 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.
+'''''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]]
+'''See also:''' [[Documentation:OCLOperators notEmpty|OCLOperators notEmpty]]
 [[Category:OCL Collection Operators]]
-{{Edited|July|12|2024}}
+{{Edited|July|12|2025}}