Getting key with the highest value from object

Question

I have a object like that one:

Object {a: 1, b: 2, undefined: 1} 

How can I quickly pull the largest value identifier (here: b

Answer 1

Very basic method. might be slow to process

var v = {a: 1, b: 2, undefined: 1};

function geth(o){
    var vals = [];    
    for(var i in o){
       vals.push(o[i]);
    }

    var max = Math.max.apply(null, vals);

     for(var i in o){
        if(o[i] == max){
            return i;
        }
    }
}

console.log(geth(v));