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on 05/12/09


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null undefined


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Undefined vs Null in javascript

 / Published in: JavaScript
 

URL: http://weblogs.asp.net/bleroy/archive/2005/02/15/Three-common-mistakes-in-JavaScript-_2F00_-EcmaScript.aspx

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  1. method | undefined | false
  2. (SomeObject.foo)	false	false
  3. (SomeObject.foo != null)	false	true
  4. (SomeObject.foo !== null)	true	true
  5. (SomeObject.foo != false)	true	false
  6. (SomeObject.foo !== false)	true	false

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