01. The Hungry Programmer js exam

function solve(meals, args) {
  let portions = 0;

  const shiftPlates = (first, second, arr) => {
    const firstIndex = Number(first);
    const secondIndex = Number(second);
    if (arr[firstIndex] !== undefined && arr[secondIndex] !== undefined) {
      const firstMeal = arr[firstIndex];
      const secondMeal = arr[secondIndex];

      arr.splice(firstIndex, 1, secondMeal);
      arr.splice(secondIndex, 1, firstMeal);
    }
  };

  const consumeMeals = (first, second, arr) => {
    const firstIndex = Number(first);
    const secondIndex = Number(second);
    if (arr[firstIndex] !== undefined && arr[secondIndex] !== undefined) {
      const count = secondIndex - firstIndex + 1;
      arr.splice(firstIndex, count);
      console.log('Burp!');
      return count;
    }
    return 0;
  };

  const infoMealCommand = (command) => {
    switch (command[0]) {
      case 'Serve': {
        if (meals.length < 1) {
          break;
        }
        console.log(`${meals.pop()} served!`);
        break;
      }
      case 'Add':
        if (command[1] === undefined) break;
        meals.unshift(command[1]);
        break;
      case 'Shift':
        shiftPlates(command[1], command[2], meals);
        break;
      case 'Eat':
        if (meals.length < 1) {
          break;
        }
        console.log(`${meals.shift()} eaten`);
        portions++;
        break;
      case 'Consume':
        portions += consumeMeals(command[1], command[2], meals);
        break;
      default:
    }
  };

  for (let i = 0; i < args.length; i++) {
    const command = args[i].split(' ');
    if (command == 'End') {
      break;
    }
    infoMealCommand(command);
  }
  if (meals.length > 0) {
    console.log(`Meals left: ${meals.join(', ')}`);
  } else {
    console.log('The food is gone');
  }

  console.log(`Meals eaten: ${portions}`);
}