Sequential code execution in angular/ typescript

Question

How can I make my code run sequentially? For example,

1. If I have a for loop which gets some data from a service, I want the n+1 iteration to run

Answer 1

SomeMethod(i, length){
       If(i< length){
          this.dataService.get(i).subscribe(  data => {
                 // do some business logic 
                 this.SomeMethod(i+1, length);

            }); 
       }else{
           console.log("Iteration completed");
       }}

Try this logical way