example for OO js in rock paper scissors

rock_paper_scissors-multi_players_game.js

var Player = function(name, match_table){
  this.name = name;
  this.rounds = [];
  this.output_options = [];
  this.score = 0;

  this.init = function () {
    for(var opt in match_table){
      this.output_options.push(opt);
    }
  }

  this.play = function(roundId){
    // console.log('Player '+this.name+' round num'+roundId);
    var output = this.output_options[Math.floor(Math.random()* this.output_options.length)];
    this.rounds[roundId] = output;
    return output;
  }

  this.win = function(){
    // console.log(this.name + ' won');
    this.score++;
  }

  this.draw = function(){
    // console.log(this.name + ' draw');
  }

  this.lose = function(){
    // console.log(this.name + ' lose');
  }

  this.init();
}

var Game = function(numOfPlayers, numOfRounds) {
  // this.players = [];
  var _this = {},
      roundId = 0;
  _this.players = [];
  _this.nameList = ['elle', 'tenny', 'malcolm', 'ali', 'richard'];
  _this.records = [];
  _this.draw_counts = 0;

  _this.match_table = {
    rock: {
      scissors: 1,
      rock: 0,
      paper: -1
    },
    paper: {
      rock: 1,
      paper: 0,
      scissors: -1
    },
    scissors: {
      paper: 1,
      scissors: 0,
      rock: -1
    }
  }

  function init () {
    console.log('Game.init');

    for(var i=0;i<numOfPlayers;i++){
      _this.players[i] = new Player(_this.nameList[i], _this.match_table);
    }

    for(var i=0;i<numOfRounds;i++){
      round();
      roundId ++;
    }

    console.log('% of draw: '+ _this.draw_counts*100/numOfRounds);
  }


  function compare (outputs){
    var winner;
    for(var i=0, len=outputs.length;i<len;i++){
      var output = outputs[i];
      var match = _this.match_table[output];
      var result = null;

      for(var j=0,len=outputs.length; j<len;j++){
        if(i===j) continue;
        if (result === null) {
          result = match[ outputs[j] ];
        } else {
          result &= match[ outputs[j] ];
        }
      }

      if (result > 0) {
        _this.players[i].win();
        winner = _this.players[i].name;
      } else if (result < 0) {
        _this.players[i].lose();
      } else if (result === 0) {
        _this.players[i].draw();
      }
    }

    return winner;
  }

  function round () {
    var outputs = [], winner;
    for(var i=0, len=_this.players.length;i<len;i++){
      var player = _this.players[i];
      outputs[i] = player.play(roundId);
    }

    _this.records.push(outputs);
    winner = compare(outputs);

    if(winner){
      console.log('The winner is ', winner);
    } else {
      console.log('Draw');
      _this.draw_counts++;
    }
  }

  init();

  return _this;
}

window.game = new Game(2, 100);