What is an injector?

An injector is a service locator that is used to retrieve the object instances as defined by the invoke methods, provider, load modules, and instantiate types.

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Example

                                        
var $injector = angular.injector();

expect($injector.get('$injector')).toBe($injector);

expect($injector.invoke(function($injector) {

   return $injector;

})).toBe($injector);