How to check undefined variable in Javascript

By Duy Michael Nguyen|javasript|Be the first to comment!

Hi folks, this comes up so often that I want to share with you on how to 'properly' check a variable is undefined.

[javascript]
if (typeof something  == "undefined")
{
// do thing when undefined
}
[/javascript]

Credits goes to open source communities and all developers sharing their works.

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