Underscore.js Collections: Filter
HTML
<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<a target="parent" href="http://underscorejs.org/#filter">Learn More</a>
JavaScript
var arr = [1, 2, 3, 4, 5, 6];
var evens = _.filter(arr, function(num){
return num % 2 == 0;
});
console.log(evens,"are the even numbers in the array");