How to make a synchronous call in angular 5?

Question

So, I was trying to get the solution of this problem. But, somehow I am unable to do so, May be because of the lack of knowledge in angular 5. This is my service:

Answer 1

there is no direct way to make a synchronous call, however you can do the following procedure (this code is written in angular 7).

import { Component, OnInit } from '@angular/core';
import {HttpClient} from '@angular/common/http';

export class SampleComponent implements OnInit {
  Request1result:Object;
  Request2result:Object;

  constructor(private http:HttpClient) { }

   ngOnInit() 
   {
    this.http.get("URL1").subscribe((res)=>{
      this.Request1result=res;
      this.after1(); // execution will move to next request only when first is done.
    });
   }
  after1()
  {
    this.http.get("URL2").subscribe((res)=>{
      this.Request2result=res;
      this.after2(); // execution will move to the rest of the code only when both the requests are done.
    });
  }
  after2()
    {
    // rest of the code.
    console.log(this.Request1result);
    console.log(this.Request2result);

    }

}