Incorporating lodash into Angularjs for enhanced functionality

After stumbling upon an app online that utilizes AngularJS with Lodash, I noticed a simple way in which Lodash is incorporated. By including the following line in the body (after angular has been included):

<script src='vendor/lodash/3.3.1/lodash.min.js'></script>
<script src='myApp.js'></script>

In the myApp.js file, the first line is:

/* global angular, _ */

After this setup, Lodash can be accessed using the underscore character (_). It's fascinating how it seamlessly works, although the reason behind it remains unclear to me.

javascriptangularjslodash

Answer №1

Lodash adds itself to the global namespace. This is achieved by assigning _ to the window object (view source code here). The line you're observing is not relevant to this process. It's actually a directive for a tool like JSHint, meant to prevent error messages about those variables being undefined.

Answer №2

To include lodash, I recommend adding it in the index.html file before angular is loaded. Personally, I like to use the bower command for this as it makes lodash available globally. Make sure to have a constant in your module referencing lodash.

angular.module('sampleApp', [])
    .constant('_', _);

You can then inject lodash into your controller or Angular component for easy access.

.controller('sampleAppController', function ($scope) {
  $scope._ = _;
})

Another option is attaching lodash to the rootScope, but I don't recommend it.

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