function switchFunction(num: number) {
  let b: string = "functionb";

  switch (num) {
    case 1: {
      let b: string = "case 1";
      break;
    } // After break
    case 2:
      {
        let b: string = "case 2";
      } // Before break
      break;
  }
}

const arr: number[] = [1, 2, 3];
arr.push(4);
// arr.push('4');