Is it possible to get the index you're sorting over in Underscore.js?

Question

I'm using the JS library Underscore and in particular using the _.each and _.sortby library calls. I'm wondering if there's any possible way to get the index of the value within the iterator delegate

_.sortBy([1, 4, 2, 66, 444, 9], function(num){      /*It'd be great to have access to the index in here */     return Math.sin(num);  }); 

Answer 1

Index is actually available like;

_.sortBy([1, 4, 2, 66, 444, 9], function(num, index){  }); 

Answer 2

You can get the index of the current iteration by adding another parameter to your iterator function, e.g.

_.each(['foo', 'bar', 'baz'], function (val, i) {     console.log(i + ": " + val); // 0: foo, 1: bar, 2: baz });