Calculate a tip based on quality of service.

tip_calculator.js

let tipCalculator = (quality, total) => {
  switch (quality) {
    case 'bad':
      return total * 0.05;
      break;
    case 'ok':
      return total * 0.15;
      break;
    case 'good':
      return total * 0.20;
      break;
    case 'excellent':
      return total * 0.30;
      break;
    default:
      return total * 0.18;
  }
}

tip = tipCalculator('', 100);

console.log(tip);