Revision: 56140
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at March 12, 2012 09:58 by EvanHahn
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// As a function
Evan.isUndefined = function(u) {
return typeof u === 'undefined';
};
// In an "if"
if (typeof foo === 'undefined') {
// ...
}
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Checking for `undefined` in JavaScript is weird (the variable can be redefined), so I made a function to do it. This stuff (and others) is also in my [JSTypes](https://github.com/EvanHahn/JSTypes) type-checking library.
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Is something undefined in JavaScript?
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JavaScript