Question

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What is the meaning of “$” sign in JavaScript

Why do we use the dollar ($) symbol in jQuery and JavaScript?
I always put a dollar in my scripts but I actuary don’t know why.

For an example:

$('#Text').click(function () {
  $('#Text').css('color', 'red')
});

This just changes the text colour when you click it, but it demonstrates my point.

Answer 1

In JavaScript it has no special significance (no more than a or Q anyway). It is just an uninformative variable name.

In jQuery the variable is assigned a copy of the jQuery function. This function is heavily overloaded and means half a dozen different things depending on what arguments it is passed. In this particular example you are passing it a string that contains a selector, so the function means “Create a jQuery object containing the element with the id Text“.