Web Reference: Feb 22, 2011 · As typeof returns undefined, undefined is a type where as null is an initializer indicates the variable points to no object (virtually everything in Javascript is an object). If it is undefined, it will not be equal to a string that contains the characters "undefined", as the string is not undefined. You can check the type of the variable: Apr 22, 2009 · The biggest misconception in many of the answers here is that 'undefined' is a Javascript keyword. It's not a keyword at all, but a variable that (most of the time) happens to be undefined. So the only time "somevar === undefined" works is when the 'undefined' variable really hasn't been defined.
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