how to return in switch javascript code example

Example 1: switch javascript

switch (a) {
    case 1:
        alert('case 1 executed');
        break;
    case 2:
        alert("case 2 executed");
        break;
   case 3:
        alert("case 3 executed");
        break;
    case 4:
        alert("case 4 executed");
        break;
    default:
        alert("default case executed");
}

Example 2: how to use switch case in javascript

switch (expression) {
  case value1:
    //Statements executed when the
    //result of expression matches value1
    [break;]
  case value2:
    //Statements executed when the
    //result of expression matches value2
    [break;]
  ...
  case valueN:
    //Statements executed when the
    //result of expression matches valueN
    [break;]
  [default:
    //Statements executed when none of
    //the values match the value of the expression
    [break;]]
}