Whats the meaning of x and arrow in this expression .subscribe(x=>x);

Question

 return this.http.post(this.config.apiUrl, user).subscribe(x=>x);

Is this arrow function but arrow function is supposed to be like this ()=>

export class ApiService {
  config = new Configuration();
  constructor(private http: HttpClient) { }
  registerUser(user: any) { 
   return this.http.post(this.config.apiUrl, user).subscribe(x=>x);
  }

score 0 · Answer 1 · answered Feb 04 '19 at 14:54

()=> is non-parameterized arrow function

x => x is equivalent to (x) => x which takes x as parameter and then returns x as result

Btw, subscription does not return value instead Subscription. When you subscribe you generally need to assign it to another variable or use it inside that subscription.

score 0 · Answer 2 · answered Feb 04 '19 at 15:10

 return this.http.post(this.config.apiUrl, user).subscribe(x=>x);

Here Subscribe function is to get the response back from the API to the calling function. (X => x).

'x' is the response from the API.(Lets say success or failure)

and you are mapping that to 'X'. (you can console it with the help of X )

Whats the meaning of x and arrow in this expression .subscribe(x=>x);

2 Answers2