JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js"></script>

JavaScript

var a = [1, 2, 3];
var b = [4, 5, 6];
var zipped = _.zip(a, b);
// This gives you:
// zipped = [[1, 4], [2, 5], [3, 6]]

var c = _.map(zipped, function(pair) {
  var first = pair[0];
  var second = pair[1];
  return first + second;
});

alert(c);