get last element of a json object in javascript

Question

I got a json object in javascript like
var json = {\"20121207\":\"13\", \"20121211\":\"9\", \"20121213\":\"7\", \"20121219\":\"4\"};
without knowing the

Answer 1

If you don't need to support old JS engines:

var lastKey = Object.keys(json).sort().reverse()[0];
var lastValue = json[lastKey];

Don't assume the keys are in order. Get the keys, and then sort them, and then grab that largest value after the sort.