class method Object.isUndefined
Object.isUndefined(object) → Boolean
-
object
(Object
) – The object to test.
Returns true
if object
is of type undefined
; false
otherwise.
Examples
Object.isUndefined();
//-> true
Object.isUndefined(undefined);
//-> true
Object.isUndefined(null);
//-> false
Object.isUndefined(0);
//-> false
Object.isUndefined("");
//-> false