Underscore provides a lot of useful helper functions in Javascript programming. Here is an example of getting an average value of a numeric array.
<!DOCTYPE html>
<html>
<head>
<title>Get average value of an array using underscore</title>
<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.7.0/underscore-min.js"></script>
</head>
<body>
<div id="average"></div>
<script type="text/javascript">
var values = [13, 17, 11, 24, 56, 31, 27, 19];
document.getElementById("average").innerHTML = arrayAverage(values);
function arrayAverage(arr) {
return _.reduce(arr, function(memo, num) {
return memo + num;
}, 0) / (arr.length === 0 ? 1 : arr.length);
}
</script>
</body>
</html>
Done =)
Reference:
Eureka! 