what are case statments used for in javascript code example

Example 1: js switch case

switch(expression) {
  case x:
    // code block
    break;
  case y:
    // code block
    break;
  default:
    // code block
}

Example 2: switch case in js

var coll1="kjc;

switch(coll1)
{
  case "kjc":
    alert("youre special");
    break;
  case "horizon":
    alert("worst behaviour");
    break;
  case "cmr" :
    alert("worst character");
    break;
  default:
    alert("kjc is best");
    break;
}