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Undefined and Null in Javascript

Understanding the undefined and null values in Javascript is very important. That's what you'll learn in this lesson along with what are falsy and truthy values.

You'll learn the proper way to check how to find if a variable is undefined or not and whether a variable is null or not.

Related:


    Warning: Invalid argument supplied for foreach() in /var/www/cssdeck/app/modules/labs/views/_details.php on line 68
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    Undefined and Null in Javascript

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