7.js

$ = function(parameters) {
  this.state = {};
  this.state.nodeList = document.querySelectorAll(parameters)
  this.state.dom = [].slice.call(state.nodeList)
  return this instanceof $ ? this : new $(parameters)
}
$.prototype = {
  left: function(){
    console.log(this.state.dom.length, "turning left")
    return this
  },
  right: function(){
    console.log(this.state.dom.length, "turning right")
    return this
  }
}