Tests if the item specified by key is defined within an object. Returns false if the item is unassigned or does not exist. See “Using %IsDefined() to Test for Valid Values” for details and examples.

   method %IsDefined(key) as %Boolean

parameters:

• key — the object key or array index of the item to be tested. An array index must be passed as a canonical integer value. Array indexes begin at position 0.

see also: Resolving Null, Empty String, and Unassigned Values

class reference: %DynamicObject.%IsDefined()Opens in a new tab and %DynamicArray.%IsDefined()Opens in a new tab