Mini jQuery esque selector.

elem.js

function elem(selector){ return document.querySelectorAll(selector); }
Object.defineProperties(NodeList.prototype, {
  'each': {
    value: function(fn){
      var self = this;
      Array.prototype.slice.call(this, 0).forEach(function (){
        fn.apply(arguments[0], arguments);
      });
      return self;
    }
  }
  // ELEMENT TRANSFORMATIONS
  ,'rotate': {
    value: function (deg){
      this.each(function (element, index){
        element.style.webkitTransform = element.style.transform = "rotate(" + deg + "deg)";
      });
    }
  }
  // CLASSES
  ,'removeClass': {
    value: function (_class, time){
      _class = _class.split(' ');
      this.each(function (element, index){
        if(time) {
          setTimeout(function(){
            _class.forEach(function (c) {
              element.classList.remove(c);
            });
          }, time);
        } else _class.forEach(function (c) {
          element.classList.remove(c);
        });
      });
      return this;
    }
  }
  ,'addClass': {
    value: function (_class, async, time){
      _class = _class.split(' ');
      this.each(function (element, index){
        if(async){
          setTimeout(function (){
            _class.forEach(function (c) {
              element.classList.add(c);
            });
          }, time || 0);
        } else _class.forEach(function (c) {
          element.classList.add(c);
        });

      });
      return this;
    }
  }
  ,'prop': {
    value: function(propName){
      return this[0][propName];
    }
  }
  ,'data': {
    value: function(propName){
      return this[0].dataset[propName];
    }
  }
  ,'styl': {
    value: function(prop, value){
      if(!value) return this[0].style[prop];
      this[0].style[prop] = value;
      return this;
    }
  }
  // ELEMENT SELECTION
  ,'get': {
    value: function (index){
      var nodeList;
      if(!this[index]) return null;
      this[index].setAttribute('wrapNodeList','');
      nodeList = document.querySelectorAll('[wrapNodeList]');
      this[index].removeAttribute('wrapNodeList');
      return nodeList;
    }
  }
  // ELEMENT CONTENT
  ,'html': {
    value: function(val){
      this.each(function (elem){
        if(!val) return elem.innerHTML; 
        elem.innerHTML = val;
        return this;
      });
    }
  }
  // EVENTS
  ,'on': {
    value: function(evName, callback, useCapture){
      this.each(function (elem){
        if(elem.addEventListener) elem.addEventListener(evName, callback, useCapture || false);
        else if(elem.attachEvent) elem.attachEvent('on' + evName, callback);
      });
      return this;
    }
  }
});