[javascript] Use underscore inside Angular controllers

How do I use underscore library inside angularjs controllers?

On this post: AngularJS limitTo by last 2 records somebody suggested to assign an _ variable to the rootScope so that the library will be available to all the scopes within the app.

But I'm not clear where to do it. I mean should it go on the app module declaration? i.e:

var myapp = angular.module('offersApp', [])
            .config(['$rootScope', function($rootScope) { }

But then where do I load underscore lib? I just have on my index page the ng-app directive and script reference to both the angular-js and underscore libs?


<body ng-app="offersApp">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="scripts/vendor/angular.js"></script>
<script src="scripts/vendor/underscore.js"></script>

How do I achieve this?

This question is related to javascript angularjs underscore.js

The answer is

When you include Underscore, it attaches itself to the window object, and so is available globally.

So you can use it from Angular code as-is.

You can also wrap it up in a service or a factory, if you'd like it to be injected:

var underscore = angular.module('underscore', []);
underscore.factory('_', ['$window', function($window) {
  return $window._; // assumes underscore has already been loaded on the page

And then you can ask for the _ in your app's module:

// Declare it as a dependency of your module
var app = angular.module('app', ['underscore']);

// And then inject it where you need it
app.controller('Ctrl', function($scope, _) {
  // do stuff

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