What is $injector and $inject?
Answers
hey
Each web application you build is composed of objects that collaborate to get stuff done. These objects need to be instantiated and wired together for the app to work. In AngularJS apps most of these objects are instantiated and wired together automatically by the injector service.
The injector creates two types of objects, services and specialized objects.
Services are objects whose API is defined by the developer writing the service.
Specialized objects conform to a specific AngularJS framework API. These objects are one of controllers, directives, filters or animations.
The injector needs to know how to create these objects. You tell it by registering a "recipe" for creating your object with the injector. There are five recipe types.
The most verbose, but also the most comprehensive one is a Provider recipe. The remaining four recipe types — Value, Factory, Service and Constant — are just syntactic sugar on top of a provider recipe.
Let's take a look at the different scenarios for creating and using services via various recipe types. We'll start with the simplest case possible where various places in your code need a shared string and we'll accomplish this via Value recipe.
hope it helps