s4cha

struct Profile {
    var identifier = 0
    var name = ""
    var stats = Stats()
}

s4cha

fetchUserId({ id in
    fetchUserNameFromId(id, success: { name in
        fetchUserFollowStatusFromName(name, success: { isFollowed in
            // The three calls in a row succeeded YAY!
            reloadList()
        }, failure: { error in
            // Fetching user ID failed
            reloadList()
        })
    }, failure: { error in

s4cha

fetchUserId()
    .then(fetchUserNameFromId)
    .then(fetchUserFollowStatusFromName)
    .then(updateFollowStatus)
    .onError(showErrorPopup)
    .finally(reloadList)

s4cha

func fetchUserId() -> Promise<Int> {
    return Promise { resolve, reject in
        doSomethingAsync { resolve(object: userId) } 
    }
}

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fetchUserId().then { id in
    print("UserID : \(id)")
}.onError { e in
    print("An error occured : \(e)")
}.finally {
    print("Everything is Done :)")
}

s4cha

fetchUserId()
    .then(printUserID)
    .onError(showErrorPopup)
    .finally(reloadList)

s4cha

diff --git a/Source/Promise.swift b/Source/Promise.swift
index f18c6ca..3186f03 100644
--- a/Source/Promise.swift
+++ b/Source/Promise.swift
@@ -39,11 +39,13 @@ public class Promise<T> {
     
     public init(callback: @escaping (_ resolve: @escaping ResolveCallBack,
         _ reject: @escaping RejectCallBack) -> Void) {
+        print("+")
         promiseCallBack = callback

s4cha

import ws
import then   // Needed to import Promise Type
import Arrow  // Needed to import JSON Type

let api = Api() // Define global api

struct Api {
    
    // Connect to the base URL
    private let ws = WS("http://jsonplaceholder.typicode.com")

s4cha

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
      
        api.getUsers().then { json in
            print(json)
        }   

s4cha

import Arrow

extension User: ArrowParsable {

    mutating func deserialize(_ json: JSON) {
        username <-- json["username"]
    }
}