lookup function in terraform
#lookup retrieves the value of a single element from a map, given its key.
#If the given key does not exist, a the given default value is returned instead.
lookup(map, key, default)
#Example to Understand
lookup({a="ay", b="bee"}, "a", "what?")
ay
lookup({a="ay", b="bee"}, "c", "what?")
what?