javascript - checking if input corresponds to 1 array value

Question

I'm having an array:

var something = ["1","2","3","4"] ;

I'll ask the user in a prompt to pick a number. if it corresponds to any value in the array it triggers something.

My question is: How do i check if the input corresponds to any array value?

if(something === "input"){
    console.log("u picked a good number");
}

Of course if statement i have now is incorrect, but how do i make it check every value in the array, and see if anything corresponds?

Would be awsome if someone could help me on this one! ;)

thxx!

possible duplicate of [Javascript: Determine whether an array contains a value](http://stackoverflow.com/questions/1181575/javascript-determine-whether-an-array-contains-a-value) - use `indexOf()` — Fabrizio Calderan, Apr 11 '13 at 08:25
possible duplicate of [array.contains(obj) in JavaScript](http://stackoverflow.com/questions/237104/array-containsobj-in-javascript) — Ivaylo Strandjev, Apr 11 '13 at 08:27

score 9 · Accepted Answer · answered Apr 11 '13 at 08:26

9

Arrays have an indexOf method which returns the index at which the argument was found in the array, or -1 if it wasn't found:

if (something.indexOf(input) > -1) {
    // In the array!
}

Note that some older browsers don't support this method, but there is a polyfill in the MDN article linked to above.

answered Apr 11 '13 at 08:26

James Allardice

Thx! this helped me alot. it works :) you made me a bit wiser! – Kevinvhengst Apr 11 '13 at 08:30

1 Answers1