ZipOperator.swift

import UIKit
import RxSwift
import RxCocoa
import Alamofire

class ViewController: UIViewController {
    
    let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        zipsample()
    }
  
    private func zipSample() {
        let dummyParameter = 1
        Observable.zip(firstAPICall(), secondAPICall()) { ($0, $1) }
            .subscribe(onNext: { response1, response2 in
                print(response1, response2, separator:"\n")
            }).addDisposableTo(disposeBag)
    } 
    
     private func firstAPICall() ->Observable<String>{
        return Observable.create({ (observer) -> Disposable in
            observer.onNext("First")
            observer.onCompleted()
            return Disposables.create()
        })
    }
    
    private func secondAPICall() ->Observable<String>{
        return Observable.create({ (observer) -> Disposable in
            observer.onNext("Second")
            observer.onCompleted()
            return Disposables.create()
        })
    }
  

}