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
9.5k
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
240
How Artsy Automates Team Culture
ashfurrow
0
3.2k
Building Custom TSLint Rules
ashfurrow
0
420
Circumventing Fear of the Unknown
ashfurrow
1
520
Building Better Software by Building Better Teams
ashfurrow
1
570
Building Open Source Communities
ashfurrow
0
860
Building Compassionate Software
ashfurrow
0
450
Swift, Briskly
ashfurrow
0
140
iOS Checkup
ashfurrow
1
850
Other Decks in Programming
See All in Programming
Flutterで分数(Fraction)を表示する方法
koukimiura
0
140
Google Opalで使える37のライブラリ
mickey_kubo
3
130
O Que É e Como Funciona o PHP-FPM?
marcelgsantos
0
190
Building, Deploying, and Monitoring Ruby Web Applications with Falcon (Kaigi on Rails 2025)
ioquatix
4
2.5k
Introduce Hono CLI
yusukebe
6
3.1k
20251016_Rails News ~Rails 8.1の足音を聴く~
morimorihoge
3
690
AIと人間の共創開発!OSSで試行錯誤した開発スタイル
mae616
2
790
CSC509 Lecture 05
javiergs
PRO
0
310
技術的負債の正体を知って向き合う
irof
0
230
組込みだけじゃない!TinyGo で始める無料クラウド開発入門
otakakot
2
360
What's new in Spring Modulith?
olivergierke
1
170
登壇は dynamic! な営みである / speech is dynamic
da1chi
0
360
Featured
See All Featured
Thoughts on Productivity
jonyablonski
70
4.9k
Raft: Consensus for Rubyists
vanstee
140
7.2k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
21
1.2k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
The Pragmatic Product Professional
lauravandoore
36
7k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
630
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
140
34k
Visualization
eitanlees
149
16k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
230
22k
The Language of Interfaces
destraynor
162
25k
A Tale of Four Properties
chriscoyier
161
23k
Into the Great Unknown - MozCon
thekraken
40
2.1k
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