Username js exam

function solve(args) {
  let inputName = args.shift();

  let inputLine = args.shift();

  while (inputLine !== 'Sign up') {
    const [command, arg1, arg2] = inputLine.split(' ');


    switch (command) {
      case 'Case':

        if (arg1 === 'lower') {
          inputName = inputName.toLowerCase();
          console.log(inputName);
        } else if (arg1 === 'upper') {
          inputName = inputName.toUpperCase();
          console.log(inputName);
        }

        break;
      case 'Reverse':


        if (inputName.length > Number(arg2)) {
          const startIndex = Number(arg1);
          const endIndex = Number(arg2);

          const takeStr = inputName.slice(startIndex, endIndex + 1);
          const reverseStr = takeStr.split('').reverse().join('');
          console.log(reverseStr);
        }

        break;
      case 'Cut':
        if (inputName.includes(arg1)) {

          const startCh = arg1[0];
          const endCh = arg1[arg1.length - 1];
          const startIndex = inputName.indexOf(startCh);
          const endIndex = inputName.lastIndexOf(endCh);
          console.log(inputName.slice(0,startIndex) + inputName.slice(endIndex + 1));
        } else {
          console.log(`The word ${inputName} doesn't contain ${arg1}.`);
        }
        break;
      case 'Replace':
        inputName = inputName.replace(new RegExp(arg1, 'g'), '*');
        console.log(inputName);
        break;
      case 'Check':

        let charArr = inputName.split('');
        let isFound = charArr.some( ch => ch === arg1);

        if (isFound) {
          console.log('Valid.');
        } else {
          console.log(`Your username must contain ${arg1}.`);
        }
        break;
      default:
        break;
    }

    inputLine = args.shift();
  }
}