Is there any way to concat http response arrays, in just one array in angular 2

Question

I have this 2 arrays that a HTTP response in Angular 2, I need to convert this two arrays in just another one that is test5, but I seem unable to sum them, any other ideas?

this.test3= this.http .get("adresssAPI1")

this.test4 = this.http .get("adressAPI2")

this.test5 = this.test 3 + this.test4

Answer 1

use Observable.combineLatest or Observable.forkJoin, see their differences here.

Observable.combineLatest(this.test3, this.test4);
Observable.forkJoin(this.test3, this.test4);

when you subscribe to Observable.combineLatest, you will get result like below:

[response3, response4]

and you can use Array.reduce to combine those two Observables' result

// combineLatest
Observable.combineLatest(this.test3, this.test4)
  .subscribe(res => {
    this.concatResult = res.reduce((pre, next) => {
      return [].concat(pre.json().data, next.json().data);
    })
  });

// forkJoin
Observable.forkJoin(this.test3, this.test4)
  .subscribe(res => {
    this.concatResult = res.reduce((pre, next) => {
      return [].concat(pre.json().data, next.json().data);
    })
  });

refer this plunker demo