BowlingGame class - Node.js Object

Node.js examples for Object:Class Definition

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Description

BowlingGame class

Demo Code


var BowlingGame = function() {
  this.rolls = [];//from w w  w  .  j a v a  2  s .c  om
  this.currentRoll = 0;
};

BowlingGame.prototype.roll = function(pins) {
  this.rolls[this.currentRoll++] = pins;
};

BowlingGame.prototype.score = function() {
  var score = 0;
  var frameIndex = 0;
  var self = this;

  function sumOfBallsInFrame() {
    return self.rolls[frameIndex] + self.rolls[frameIndex + 1];
  }

  function spareBonus() {
    return self.rolls[frameIndex + 2];
  }

  function strikeBonus() {
    return self.rolls[frameIndex + 1] + self.rolls[frameIndex + 2];
  }

  function isStrike() {
    return self.rolls[frameIndex] === 10;
  }

  function isSpare() {
    return self.rolls[frameIndex] + self.rolls[frameIndex + 1] === 10;
  }

  for (var frame = 0; frame < 10; frame++) {
    if (isStrike()) {
      score += 10 + strikeBonus();
      frameIndex++;
    } else if (isSpare()) {
      score += 10 + spareBonus();
      frameIndex++;
    } else {
      score += sumOfBallsInFrame();
      frameIndex += 2;
    }
  }
  return score;
};


/* 
sample game, all strikes, 1st frame is gutter balls

game.roll(0);
game.roll(0);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
game.roll(10);
console.log(game.score());

*/

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