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Javascript check for undefined or null object/variable

/ Published in: JavaScript
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Based on some comments in [StackOverflow Question](http://stackoverflow.com/questions/95875/javascript-check-to-see-if-a-variable-is-an-object "How to check if a variable is an object")

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  1. if(typeof(foo) !== 'undefined' && foo != null) {
  2.     //you can use foo!
  3. }

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