how to make switch statement 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: javascript switch

let color = "black";

switch(color){
    case "red":
        console.log("color is red");
        break;
    case "white":
        console.log("color is white");
        break;
    case "black":
        console.log("color is black");
        break;
    default:
        console.log("unknow color");
}

Example 3: multiple case switch javascript

switch (varName)
{
   case "afshin":
   case "saeed":
   case "larry": 
       alert('Hey');
       break;

   default: 
       alert('Default case');
}