In JavaScript, a switch statement for several situations is used.

Problem

In JavaScript, I require numerous cases in a switch statement, such as:

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

   default:
       alert('Default case');
       break;
}

How can I do that? If there’s no way to do something like that in JavaScript, I want to know an alternative solution that also follows the DRY concept.

Asked by Afshin Mehrabani

Solution #1

Use the switch statement’s fall-through feature. You may express it like this: A matched case will run until a break (or the end of the switch statement) is discovered.

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

   default: 
       alert('Default case');
}

Answered by kennytm

Solution #2

This is how it works in standard JavaScript:

function theTest(val) {
  var answer = "";
  switch( val ) {
    case 1: case 2: case 3:
      answer = "Low";
      break;
    case 4: case 5: case 6:
      answer = "Mid";
      break;
    case 7: case 8: case 9:
      answer = "High";
      break;
    default:
      answer = "Massive or Tiny?";
  }
  return answer;
}

theTest(9);

Answered by Rob Welan

Solution #3

Here’s a second way that doesn’t use the switch statement at all:

var cases = {
  afshin: function() { alert('hey'); },
  _default: function() { alert('default'); }
};
cases.larry = cases.saeed = cases.afshin;

cases[ varName ] ? cases[ varName ]() : cases._default();

Answered by elclanrs

Solution #4

To assign several cases in a switch in Javascript, we must declare each case separately without a break in between, as seen below:

   <script>
      function checkHere(varName){
        switch (varName)
           {
           case "saeed":
           case "larry":
           case "afshin":
                alert('Hey');
                break;
          case "ss":
               alert('ss');
               break;
         default:
               alert('Default case');
               break;
       }
      }
     </script>

Click on the link to see an example.

Answered by Er. Anurag Jain

Solution #5

I like this for clarity and a DRY syntax.

varName = "larry";

switch (true)
{
    case ["afshin", "saeed", "larry"].includes(varName) :
       alert('Hey');
       break;

    default:
       alert('Default case');

}

Answered by Kyle Dudley

Post is based on https://stackoverflow.com/questions/13207927/switch-statement-for-multiple-cases-in-javascript