What are useful JavaScript methods that extends built-in objects?

Posted by Canavar on Stack Overflow See other posts from Stack Overflow or by Canavar
Published on 2009-07-16T13:04:39Z Indexed on 2010/04/28 0:43 UTC
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JavaScript

What are your most useful, most practical methods that extends built-in JavaScript objects like String, Array, Date, Boolean, Math, etc.?

String

Array

indexOf

Date

toMidnight

Note : Please post one extended method per answer.

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Developer IT

What are useful JavaScript methods that extends built-in objects? - Developer IT

What are useful JavaScript methods that extends built-in objects?

JavaScript

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Has Javascript developed beyond what it was originally designed to do?

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Javascript in XSL that is loaded by Javascript

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