CODEWITHSUNDEEP
angularrxjsobservable
Fishlex
Fishlex

Reputation: 46

Http observable response parse into array

Just started with angular(version 7). I try to get a response from json-placeholder, an array of todos. That should return an array but when i console.log(typeof rsp) it shows an object.

Observable:

url: string = 'https://jsonplaceholder.typicode.com/todos';

getHomeTodos() {
    return this.http.get(this.url);
}

Observer in my component:

ngOnInit() {
this.todosService.getHomeTodos()
    .subscribe((rsp) => {
      this.homeTodos = rsp;
    });
}

Any ideas why the type of rsp is 'Object' but on the json-placeholder it shows it returns an array? Thanks.

Upvotes: 1

Views: 1945

Answers (1)

Igor
Igor

Reputation: 62213

So how can i use a method like splice on the object returned?

I think I see what your question is. You need to specify the return type in get as well as getHomeTodos so you add type safety and the IDE can suggest methods/members on the types like splice on an array.

export interface IToDo { /* members here */ }

url: string = 'https://jsonplaceholder.typicode.com/todos';
getHomeTodos():Observable<IToDo[]> {
    return this.http.get<IToDo[]>(this.url);
}

homeTodos: IToDo[];
ngOnInit() {
  this.todosService.getHomeTodos()
    .subscribe((rsp) => {
      this.homeTodos = rsp;
    });
}

This added type safety and now you can use splice or other Array prototype members.

Upvotes: 1

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