IsDefined
Last updated
Last updated
Determine whether a given variable reference exists.
For example:
isDefined( "luis" )
will test for the existence of an lmajano
variable in any accessible scope.
isDefined( "variables.foo" )
will test for the existence of a foo
variable in the variables
scope.
isDefined( "brad.age" )
will test for the existence of an age
key in the brad
struct, in any accessible scope
Argument | Type | Required | Description | Default |
---|---|---|---|---|
variable
string
true
The variable reference to test for existence. For security reasons, only dot-notation is supported. Struct/array bracket notation is not supported, nor is function invocation, etc.