02. Array Modifier mid exam

function exam(args) {
  let numbersArr = args.shift().split(' ').map(Number);


  args.forEach((element) => {
    const [command, index1, index2] = element.split(' ');

    const num1 = numbersArr[Number(index1)];
    const num2 = numbersArr[Number(index2)];

    while (command !== 'end') {
      switch (command) {
        case 'swap':

          numbersArr.splice(index1, 1, num2);
          numbersArr.splice(index2, 1, num1);

          break;
        case 'multiply':
          const product = num1 * num2;

          numbersArr.splice(index1, 1, product);

          break;
        case 'decrease':
          const degreArr = numbersArr.map((item) => item - 1);
          numbersArr = [...degreArr];

          break;

      }

      break;
    }
  });


  console.log(numbersArr.join(', '));
}