contains. Check for key existance in hash [3.2.3]

^hash.contains[key]

The method checks if a hash contains the specified key. It returns bool value (true/false).
Using
^hash.contains[_default] you can check whether the hash has the default value specified [3.4.5].

Example
Code…

^if(^man.contains[birthday]){
   Birthday specified for visitor.
}





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