Do we 'declare' jQuery or we simply use it?

Question

I was asked in an interview that how do you 'declare' jQuery? He did not mean a jQuery variable or a $(func()). In case you find this question weird, please do not penalize me for this as I'm enquiring just cause I was asked. :)

Answer 1

You don't "declare" jQuery, you just include the file within a script tag:

<script src="/locationof/jQuery.js"></script>

If you look in the jQuery source it appends itself to window.$ and window.jQuery when it runs as the source code is in a self-executing anonymous function.

(function( window, undefined ) {
   // rest of source here

   // Expose jQuery to the global object
   window.jQuery = window.$ = jQuery;
})(window);