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 - use indexOf() — Fabrizio Calderan
– Fabrizio Calderan, Commented Apr 11, 2013 at 8:25

James Allardice · Accepted Answer · 2013-04-11 08:26:09Z

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, 2013 at 8:26

James Allardice

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1 Comment

Thx! this helped me alot. it works :) you made me a bit wiser!