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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 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.

Note: A Word on Modules

In order for the injector to know how to create and wire together all of these objects, it needs a registry of "recipes". Each recipe has an identifier of the object and the description of how to create this object.

Each recipe belongs to an AngularJS module . An AngularJS module is a bag that holds one or more recipes. And since manually keeping track of module dependencies is no fun, a module can contain information about dependencies on other modules as well.

When an AngularJS application starts with a given application module, AngularJS creates a new instance of injector, which in turn creates a registry of recipes as a union of all recipes defined in the core "ng" module, application module and its dependencies. The injector then consults the recipe registry when it needs to create an object for your application.

Let's say that we want to have a very simple service called "clientId" that provides a string representing an authentication id used for some remote API. You would define it like this:

Notice how we created an AngularJS module called myApp , and specified that this module definition contains a "recipe" for constructing the clientId service, which is a simple string in this case.

And this is how you would display it via AngularJS's data-binding:

In this example, we've used the Value recipe to define the value to provide when DemoController asks for the service with id "clientId".

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Origin of posterior

1525–35; < Latin, comparative of posterus coming after, derivative of post after
1 . See back .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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C16: from Latin: latter, from posterus coming next, from post after
Collins English Dictionary - Complete Unabridged 2012 Digital Edition © William Collins Sons Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

1530s, "later," from Latin posterior "after, later, behind," comparative of posterus "coming after, subsequent," from post "after" (see post- ). Meaning "situated behind" is from 1630s.

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"buttocks," euphemistic, 1610s, from posterior (adj.). Earlier it meant "those who come after, posterity" (1530s). Cf. Lithuanian pasturas "the last, the hindmost," from pas "at, by."

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