21. Understanding AngularJS Modules and Dependency Injection
One of the most important aspects of AngularJS to understand is dependency injection and how it relates to modules. Dependency is a common concept across many server-side languages but has not really been implemented much in JavaScript until AngularJS.
Dependency injection allows AngularJS modules to maintain a very clean, organized form and yet more easily access functionality from other modules. When implemented correctly, it also tends to reduce the amount of code by a considerable amount.
This chapter provides a basic overview of dependency injection and then describes how to create modules that provide functionality and how to consume that functionality in other modules as well ...
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