Generator-based slot machine game #2

generator-slot-game-2.js

const getRandomInt = (range) => Math.floor(Math.random() * range);

// Create an array of symbols for the slot machine
const symbols = ['🍒', '🍋', '🔔', '7️⃣', '🎱'];

// Define a generator function that will yield a random symbol 
// from the array when iterated over
function* getReels(noOfReels = 3) {
  let i = 0;
  while (i++ < noOfReels) {
    yield symbols[getRandomInt(symbols.length)];
  }
}

function* getSlotMachine() {
  let balance = 0;
  let betSize = 10;
  let round = 1;

  while (balance === 0) {
    const deposit = yield 'Please deposit money';
    balance += isNaN(deposit) ? 0 : deposit;
  }

  while (balance > 0) {
    const deposit = yield `\nRound ${round++}. Balance: ${balance}`;
    balance += isNaN(deposit) ? 0 : deposit;

    if (balance - betSize < 0) {
      break;
    }
    balance -= betSize;

    const result = [...getReels()];
    const areSame = new Set(result).size === 1;

    yield result.join(' | ');

    if (areSame) {
      const winSize = symbols.indexOf(result[0]);
      const winInCoins = betSize * (winSize + 1);
      balance += winInCoins;
      yield `Win: ${winInCoins}`;
    } else {
      yield 'No win';
    }
  }
}

let state;
const game = getSlotMachine();
game.next();
state = game.next(30);
console.log(state.value);

const gameRounds = [...game];
gameRounds.forEach(console.log);