Angular Services

https://www.pluralsight.com/courses/services-angular

by Jim Cooper

  • Creating Custom Angular Services
    • Why Are Angular Services Necessary?
    • The Single Responsibility Principle
    • Cloning Our Demo Project
    • Exploring Our Demo Project
    • Creating an Angular Service
    • Injecting and Using Services
    • Cross-component Communication with Services
  • Creating Reactive and Asynchronous Angular Services
    • The Need for Reactivity in Angular Services
    • Using RxJS for Reactivity
    • Using Angular Signals for Reactivity
    • Improving Service Encapsulation
      • how to create a readonly signal
    • Configuring Angular Projects to Work with APIs
    • Calling APIs from an Angular Service
    • Using the Async Pipe
  • Understanding Angular Dependency Injection
    • What Is Dependency Injection?
    • Benefits of Dependency Injection
    • Example Implementations of Dependency Injection
    • Angular Dependency Injection
  • Angular Service Providers
    • What Are Service Providers and Injectors?
    • How Providers Affect Instantiation
    • Using Classes as Provider Tokens
    • Creating useFactory() Providers
    • Using Providers to Create Multiple Service Instances
      • if you want unique instances of a service in a module, you must lazily load that module
    • Challenges with Providing Services Using Interfaces
      • Interfaces cannot be used as provider tokens
    • Creating a Configurable Cart
    • Creating useValue() Providers
    • Supplying Provider Dependencies (deps)
    • Using the multi Property
  • Angular Service Injectors
    • What Are Service Injectors?
    • How Angular's Hierarchical Injectors Work
      • Every Angular application has at minimum three injectors
    • Configuring Injectors
    • A Graphical Look at Injectors
      • providing services at the component level affects that component and all of its children components 
      • Eagerly loaded modules and lazily loaded modules will traverse the injector tree differently; Lazily loaded modules get their own module injector while eagerly loaded modules won’t.
    • Defining Component-level Providers
      • Using interface for dependencies is not a best practice in Angular
    • Resolution Modifiers: @Self(), @SkipSelf(), @Host() and @Optional()
      • @Self() means the component needs to provide its own instance.
      • @SkipSelf() is the opposite of @Self().
    • Standalone Projects: Route-level Injectors and Providers
      • In standalone components, you can provide services in router (because there is no module)
    • Standalone Projects: Application-wide Providers ░

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