jQuery

/*
 * jQuery - New Wave Javascript
 *
 * Copyright (c) 2006 John Resig (jquery.com)
 * Licensed under the MIT License
 */

function jQuery(selector, context) {
    // The jQuery object is actually just the init constructor 'enhanced'
    return new jQuery.fn.init(selector, context);
}

jQuery.fn = jQuery.prototype = {
    init: function(selector) {
        // The magic: "Write less, do more"
        if (typeof selector === "string") {
            return document.querySelectorAll(selector);
        }
    },
    
    each: function(callback) {
        return jQuery.each(this, callback);
    }
};

// Revolutionized web development
window.$ = window.jQuery = jQuery;