View source for Documentation:OCLOperators whenfalse

{{Edited|July|12|2025}}
The '''whenfalse''' OCL operator is the opposite of the [[Documentation:OCLOperators whentrue|whentrue]] operator. It is used to specify an expression to be run when the Boolean argument expression is false. 

It can be used to chain Boolean expressions.

==== Example ====
 let x=SomeObject.SomeEnum in (  
   (x=#Enum1).whenfalse(SomeObject.DoYourThing1);  
   (x=#Enum2).whenfalse(SomeObject.DoYourThing2);  
   (x=#Enum3).whenfalse(SomeObject.DoYourThing3) 
 )


If this is FALSE, do something.

'''Example Using <code>whenfalse</code>:'''<syntaxhighlight lang="abap">
isValid = false

</syntaxhighlight><syntaxhighlight lang="abap">
isValid.whenfalse(User.showErrorMessage)

</syntaxhighlight>

* If <code>isValid</code> is '''false'''  show error message
* Otherwise do nothing

* Result returned: <code>isValid</code> (false)

==== See: ====

* [[Documentation:OCLOperators whentrue|OCLOperator whentrue]]

[[Category:EAL (Executable Action Language)]]
[[Category:Assignment & flow control]]