What is the use implementing interface in angular HttpClient?

Question

I implemented interface for http get, post,put requests but I am not finding any difference with/without interface.

code

public get_api<T>(path: string) {
   return this.http.get<T>(API_ENDPOINT + path);
 }

In Other component

this.http_global.get_api<Interface>('user').subscribe(.....=>);

Any one helps ?

Thanks In Advance !!!

Please provide code that shows what you're doing.

Joshua Terrill
– Joshua Terrill

2018-12-16 07:37:08 +00:00
Commented Dec 16, 2018 at 7:37 — Joshua Terrill
– Joshua Terrill, Commented Dec 16, 2018 at 7:37
Hi edited my question with code

Vyas Reddy
– Vyas Reddy

2018-12-16 07:43:26 +00:00
Commented Dec 16, 2018 at 7:43 — Vyas Reddy
– Vyas Reddy, Commented Dec 16, 2018 at 7:43
Do you understand the purpose of generics in general?

Paul Samsotha
– Paul Samsotha

2018-12-16 08:08:27 +00:00
Commented Dec 16, 2018 at 8:08 — Paul Samsotha
– Paul Samsotha, Commented Dec 16, 2018 at 8:08

Joshua Terrill · Accepted Answer · 2018-12-16 07:48:20Z

2

Interfaces are used for type-checking responses. In the example that you gave, I don't believe it would actually give you anything that you don't have already. However, if you were returning a specific object from the response of a GET request, you could create an interface with those properties, and cast the response of the GET request to be that interface. This will give you access to those properties down the road when you have the response and want to reference the properties inside. You can find more information about this here: https://angular.io/guide/http#type-checking-the-response

answered Dec 16, 2018 at 7:48

Joshua Terrill

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