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To determine if a variable defined / declared

Question asked by Sai_Krishna_10325 on Feb 2, 2018
Latest reply on Feb 2, 2018 by Sai_Krishna_10325
Is there a way to determine if a variable is defined or declared on run time before it is actually executed ?
I tried using GET_DATATYPE(variable) to see if variable is declared or not based on the data type that was returned,  but its just returning blank response.

Please suggest..