BrumJS - rock paper scissors

rock_paper_scissors.js

// BrumJS - Rock Paper Scissors bots game
// http://www.meetup.com/Brum-JS/events/218927668/
// https://github.com/mancjs/rock-paper-scissors

// water beats dynamite
// dynamite beats everything (max 5 use)

// for keeping track of some stuff
var game = {};
game.me = {};
game.them = {};

game.me.dynamite_remain = 5;
game.them.dynamite_remain = 5;

var moves = ['rock', 'paper', 'scissors'];

/**
 * First run, lets you know who you're playing
 *
 * @param String opponent
 */
var init = function(opponent) {
  game.them.name = opponent;
};

/**
 * Game loop calls this 50 times
 *
 * @return String 'rock', 'paper', 'scissors', 'water', 'dynamite'
 */
var play = function() {

  // ME dynamite
  // do we have any dynamite?
  if (game.me.dynamite_remain > 0) {
    // one in 10 chance of dynamite
    if (randomMove(10) === 5) {
      game.me.dynamite_remain--;
      return 'dynamite';
    }
  }

  // THEM dynamite
  // only play water if they have dynamite remaining
  if (game.them.dynamite_remain > 0) {
    // one in 10 chance of water.. i have no idea what the optimal is
    if (randomMove(20) === 5) {
      return 'water';
    }
  }

  var pos = randomMove(3);
  return moves[pos];
};

/**
 * The called in game loop.
 *
 * @param Object res - who won, who played what. keyed to player names.
 */
var result = function(res) {
  // res.winner = 'foo';
  // res.foo = 'paper';
  // res.bar = 'rock';

  if (res[game.them.name] === 'dynamite') {
    game.them.dynamite_remain--;
  }

};


function randomMove(size) {
  if (typeof(size) === 'undefined') {
    size = 3
  };

  return parseInt(Math.random() * 100) % size;
}

// TESTS - uncomment to run
// just avoids basic syntax errors by excercising code.

// var last_hand = {};
// last_hand.winner = 'foo';
// last_hand.foo = 'paper';
// last_hand.bar = 'rock';

// init('foo');

// var games = 50;
// do {
//   console.log(play());
//
//   result(last_hand);
//
//   games--;
// }
// while (games > 0);