Documentation:OCLOperators isEmpty: Difference between revisions

OCLOperators isEmpty

Latest revision as of 07:51, 17 June 2024

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: @@
-Returns true if the collection is empty
+<message>Write the content here to display this box</message>
-[[Category:OCLOperators]]
+=== isEmpty () : Boolean ===
+Returns true if ''self'' is empty - otherwise, returns false.
+{| class="wikitable"
+!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]]
+[[Category:OCL Collection Operators]]
+{{Edited|July|12|2024}}