fakeQuery.js

var sys = require('sys');

var dom = [
  { tag: 'p', innerHTML: 'Test 1', color: 'green' },
  { tag: 'p', innerHTML: 'Test 2', color: 'black' },
  { tag: 'p', innerHTML: 'Test 3', color: 'red' },
  { tag: 'div', innerHTML: 'Name: Bob' }
];

function fakeQuery(selector) {
  return new fakeQuery.fn.init(selector);
}

fakeQuery.fn = fakeQuery.prototype = {
  init: function(selector) {
    this.selector = selector;
    this.length = 0;
    this.prevObject = null;

    if (!selector) {
      return this;
    } else {
      return this.find(selector);
    }
  },

  find: function(selector) {
    var elements = [],
        ret = fakeQuery();
    for (var i = 0; i < dom.length; i++) {
      if (dom[i].tag === selector) {
        elements.push(dom[i]);
      }
    }
    ret.elements = elements;
    ret.selector = selector;
    ret.length = elements.length;
    ret.prevObject = this;
    return ret;
  },

  color: function(value) {
    var ret = fakeQuery(this.selector);
    ret.elements = this.elements;
    ret.prevObject = this;
    for (var i = 0; i < ret.length; i++) {
      ret.elements[i].color = value;
    }
    return ret;
  }
};

fakeQuery.fn.init.prototype = fakeQuery.fn;

sys.puts('p:');
sys.puts(sys.inspect(fakeQuery('p')));
sys.puts('changing to red:');
sys.puts(sys.inspect(fakeQuery('p').color('red')));
sys.puts(sys.inspect(fakeQuery('p').color('red').elements));