Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Comparative Asynchronous Programming
Search
Ash Furrow
February 24, 2017
Programming
2
9.4k
Comparative Asynchronous Programming
Presented at Playgrounds Conf:
http://www.playgroundscon.com/
Ash Furrow
February 24, 2017
Tweet
Share
More Decks by Ash Furrow
See All by Ash Furrow
Migrating to React Native: A Long-Term Retrospective
ashfurrow
0
220
How Artsy Automates Team Culture
ashfurrow
0
3k
Building Custom TSLint Rules
ashfurrow
0
410
Circumventing Fear of the Unknown
ashfurrow
1
500
Building Better Software by Building Better Teams
ashfurrow
1
540
Building Open Source Communities
ashfurrow
0
840
Building Compassionate Software
ashfurrow
0
410
Swift, Briskly
ashfurrow
0
130
iOS Checkup
ashfurrow
1
830
Other Decks in Programming
See All in Programming
C++20 射影変換
faithandbrave
0
490
F#で自在につくる静的ブログサイト - 関数型まつり2025
pizzacat83
0
300
Go Modules: From Basics to Beyond / Go Modulesの基本とその先へ
kuro_kurorrr
0
120
iOSアプリ開発で 関数型プログラミングを実現する The Composable Architectureの紹介
yimajo
2
210
The Evolution of Enterprise Java with Jakarta EE 11 and Beyond
ivargrimstad
1
790
ReadMoreTextView
fornewid
1
450
型付きアクターモデルがもたらす分散シミュレーションの未来
piyo7
0
790
Datadog RUM 本番導入までの道
shinter61
1
300
統一感のある Go コードを生成 AI の力で手にいれる
otakakot
0
3k
無関心の谷
kanayannet
0
180
アンドパッドの Go 勉強会「 gopher 会」とその内容の紹介
andpad
0
240
レガシーシステムの機能調査・開発におけるAI利活用
takuya_ohtonari
0
600
Featured
See All Featured
Thoughts on Productivity
jonyablonski
69
4.7k
What’s in a name? Adding method to the madness
productmarketing
PRO
22
3.5k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.8k
Git: the NoSQL Database
bkeepers
PRO
430
65k
Making Projects Easy
brettharned
116
6.2k
The Pragmatic Product Professional
lauravandoore
35
6.7k
Making the Leap to Tech Lead
cromwellryan
134
9.3k
How to Think Like a Performance Engineer
csswizardry
24
1.7k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
480
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
16
930
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.4k
Code Reviewing Like a Champion
maltzj
524
40k
Transcript
Comparative Asynchronous Programming
None
Agenda 1. Asynchronous programming is hard. 2. Swift already supports
a few async methodologies. 3. Swift supports some other paradigms. 4. But lacks support for others.
Asynchronous Programming: Difficult and Subjective
“Normal” programming
let returnValue = someFunctionCall()
Asynchronous programming
Development is all about tradeoffs
let file = readFile() ... readFile() { file in ...
}
Embrace Tradeoffs
Swift Has Async Built-in. Sorta.
Built-in Async Approaches
Grand Central Dispatch
NSOperationQueue / DRBOperationTree
POSIX Threads
Target / Action
Callbacks / Completion Handlers
logIn(with: credentials) { result in // Handle login success or
failure }
Callback Hell
getCredentialsFromUser() { credentials in logIn(with: credentials) { result in //
Handle login success or failure } }
getCredentialsFromUser() { credentials, error in if credentials { logIn(with: credentials)
{ login, error in if login { // Handle login success } else { // Handle error } } } else { // Handle error } }
(credentials: Credentials?) -> Void (credentials: Credentials?, error: Error?) -> Void
(result: Result<Credentials>) -> Void
enum Result<T> { case success(T) case error(Error) }
Callback Heaven
Some Async Abstractions are Supported in Swift
Promises & Futures
getCredentialsFromUser() .flatMap { credentials in return login(with: credentials) } .onSuccess
{ login in // Handle login success } .onFailure { error in // Handle login error }
Functional Reactive Programming
getCredentialsFromUser() .flatMap { credentials in return login(with: credentials) } .on(next:
{ login in // Handle login success }, error: { error in // Handle login error })
None
gerstureRecognizer.rx .event .map { recognizer in return recognizer.location(in: recognizer.view) }
.bind(to: circle.rx.center)
Actor Model
None
Actor Model
Some Async Abstractions are Impossible in Swift
Async / Await
async func logIn() -> Login { let credentials = await
getCredentialsFromUser() return await logIn(with: credentials) }
Coroutines and Generator Functions
func fibGenerator*() -> Int { var i = 0, j
= 1 repeat { let next = i + j yield next (i, j) = (j, next) } while true } fibGenerator() // returns 1 fibGenerator() // returns 2 fibGenerator() // returns 3 fibGenerator() // returns 5
Wrap Up 1. There’s no “right way” to do async
programming. 2. Asynchronous abstractions built into Swift aren’t great. 3. There are some cool things you can do in Swift. 4. There are other cool things that you can’t do in Swift.
None