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What "Hidden Features" of JavaScript do you think every programmer should know?
After having seen the excellent quality of the answers to the following questions I thought it was time to ask it for JavaScript.
Hidden Features of HTML
Hidden Features of CSS
Hidden Features of PHP
Hidden Features of ASP.NET
Hidden Features of C#
Hidden Features of Java
Hidden Features of Python
Even though JavaScript is arguably the most important Client Side language right now (just ask Google) it's surprising how little most web developers appreciate how powerful it really is.
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