How does jQuery makes the jQuery object both a function and an object property?

Question

I've been wondering for a long time how jQuery can be both a function and an object property.

You can use it like a function, jQuery(...) and you can use it like a property jQuery.ajax(...)

How can you achieve a such thing in Javascript?

Answer 1

functions are objects in javascript. So you can have your main function

var $ = function() {  alert('wat'); }

and then extend it

$.fadeTo = function() { alert('fadeto'); }