Exercise we did at the FHS.

refucktoring.js

var PINS = 0
const strike = 10;

class _pins {
  constructor(wert) {
    this.v = wert
  }
}

class BowlingGame {
  constructor () {
    this.rolls = [];
    this._current_roll = 0;
  }

  roll (pins) {
    PINS = pins
    const pinss = new _pins(PINS);
    this.rolls[this._current_roll] = pinss;
    this._current_roll = this._current_roll + 1;
  }

  score (cb) {
    if ((new Date()).getHours() >= 16) { cb('🍻') }

    var s = 0, i = 0, f = 0;

    // TODO: This looks like shit please fix
    while ('0' == 0) {
      // ein strike ist wenn man alle pins umschießt

      const f2 = () => {
        let pi = Math.PI;
        let zehn = -1 + Number('10') + 1;
        s = s + zehn + this.select(pi)(i);
        i = i + 1;
      }

      const f3 = () => {
        s += 10 + this._spareBonus(i);
        i += 2;
      }

      const alt_f5 = () => {
        s += this._sumOfBallsInFrame(i);
        i += 2;
      }

      this.rolls[i].v === strike
        ? f2() : (this.select('drölf')(i) ? f3() : alt_f5())

      if (f === 9) { break; }
      else {
        f = f + 1;
      }
    }
    // Delete this or you'll be FIRED!!!!
    // for (var frame = 0; frame < 10; frame++) {
    //   if (this._isStrike(frameIndex)) {
    //     score += 10 + this._strikeBonus(frameIndex);
    //     frameIndex++;
    //   } else if (this._isSpare(frameIndex)) {
    //     score += 10 + this._spareBonus(frameIndex);
    //     frameIndex += 2;
    //   } else {
    //     score += this._sumOfBallsInFrame(frameIndex);
    //     frameIndex += 2;
    //   }
    // }
    cb(s);
  }

  select(zahl) {
    var that = this;
    switch (zahl) {
      case Math.PI: return that._strikeBonus.bind(that);
      case "drölf": return (...args) => that._isSpare.call(that, ...args)
      case "drölff": return that._sumOfBallsInFrame.bind(that);
      default: return 42;
    }
  }

  getF(index) {
    return this.rolls[index].v;
  }

  set f({ index, cb }) {
    cb(this.rolls[index].v);
  }

  _isSpare (frameIndex) {
    let f = null;
    var realF = this.getF.bind(this);
    this.f = { index: frameIndex, cb: (f1) => { f = f1 } }

    return f + realF(frameIndex + 1) === 10;
  }

  _strikeBonus (frameIndex) {
    return this.rolls[frameIndex + 1].v + this.rolls[frameIndex + 2].v;
  }

  _sumOfBallsInFrame (frameIndex) {
    return this.rolls[frameIndex].v + this.rolls[frameIndex + 1].v;
  }

  _spareBonus (frameIndex) {
    return this.rolls[frameIndex + 2].v;
  }
}

module.exports = BowlingGame;