Category: Underscore

In this tutorial we will be giving out some quick examples of underscore.js functionality. To know more go here. There are so many to choose such as arrays, collections, objects, etc.

Q: What is underscore.js you ask?
A: It is a JavaScript library which provides utility functions for common programming tasks.

First thing we need to do is install it. You will need a node site already ready to go. If you don’t have one you can follow this tutorial on setting a basic one up.

npm install underscore --save

On whatever page you are working with all you need to do is add the following to where your requires are.

var _ = require('underscore');

Now we can use the functionality as we wish. I will do some basic uses below.

Array first:

Let’s say we want to get the first item in an array. This would return “456”.

_.first([456,6,32,11,99])

Array uniq:

If you want to trim out the duplicates in an array. This would return “456 6 32 11 99 89 45”.

_.uniq([456, 6, 32, 11, 99, 6, 89, 99, 45])

Collections contains:

If you want to check that a collection has a value. This will return “false” because 3 is not in the collection.

_.contains([4,5,6], 3)