What is the $ symbol used for in JavaScript

It doesn't mean anything special.

But because

$

is allowed in identifier names, many Javascript libraries have taken to using

$

as the "central" interface to them, or at least as a shortcut for accessing their functionality.

For example, if you're using jQuery and you say

$("div")

, this is a call to the

$

function with argument "div". When you say

$.post()

, it's calling the

post

method on the

$

object (Javascript is nice in that functions are first-class objects).

from:

http://stackoverflow.com/questions/3107543/what-is-the-symbol-used-for-in-javascript