Guide to Angular Interface Styling - Ambiguous Suggestions

After reviewing the Angular style guide for interfaces, I find two recommendations particularly perplexing:

The suggestion to use a class instead of an interface for services and declarables (components, directives, and pipes) leaves me puzzled.

Similarly, the advice to utilize an interface for data models is unclear.

Why should a class be preferred over an interface for certain components?

Moreover, what does it mean for an interface-class to serve as a provider lookup token in Angular dependency injection?

Is there truly no alternative to defining a service as a class in Angular?

Contrary to Angular's Tour of Heroes tutorial, where the Hero model is represented as a class, it appears that using an interface may provide some benefit:

export class Hero {
  constructor(public id: number, public name: string) { }
}

Furthermore, could someone clarify the concept of an interface-class and elaborate on the term provider lookup token?

Examples illustrating these concepts would greatly enhance my understanding. Thank you.

Answer №1

  1. While the discussion may seem a bit disconnected, it revolves around utilizing a class (model) to fetch data, as exemplified by this line of code:

    this.service.getSomething().subscribe((model: myModel) => model);
    .

  2. An interface-class serves as an interface or model in programming terminology.

  3. The concept of a provider lookup token is crucial for Angular's dependency injection mechanism to determine which provider to employ. For a detailed explanation, check out this link.

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