davidchoo12

function shuffle (action, inputString, optionalArgs) {
  if (action && !parseInt(action)) throw 'invalid action type';
  if (action < 1 || action > 4) throw 'action out of range';
  if (action == 1) {
    const end = inputString.slice(-1 * optionalArgs);
    return end + inputString.slice(0, -1 * optionalArgs);
  } else if (action == 2) {
    return inputString.split('').reverse().join('');
  } else if (action == 3) {
    var n = 0; var x = '';