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You must make sure your class is registered as a provider of a service. This is done through the metadata in the @Injectable decorator declaration, the providedIn argument. When you provide the service at the root level, Angular creates a single, shared instance of |
Injecting a Service
Make the changes to your code and see what happens when you run it (remember in this example, the HEROES entity is a predefined array of Hero objects).
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Services can be injected into other Services, which may then be injected into Components. |