javascript - How to shorten my conditional statements

Question

I have a very long conditional statement like the following:

if(test.type == 'itema' || test.type == 'itemb' || test.type == 'itemc' || test.type == 'itemd'){
    // do something.
}

I was wondering if I could refactor this expression/statement into a more concise form.

Any idea on how to achieve this?

Answer 1

You can use switch statement with fall thru:

switch (test.type) {

  case "itema":
  case "itemb":
  case "itemc":
  case "itemd":
    // do something
}