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
入門ReactiveX / about ReactiveX
Search
Mihyaeru
June 27, 2016
Technology
3
450
入門ReactiveX / about ReactiveX
Mihyaeru
June 27, 2016
Tweet
Share
More Decks by Mihyaeru
See All by Mihyaeru
会計 freee バックエンドの今後 / freee backend api
mihyaeru21
8
25k
Railsで実装されている機能のマイクロサービスへの切り離し / split to microservices from rails
mihyaeru21
1
820
WebエンジニアのためのMySQLデータ構造基礎(再) / mysql data structure for web developer 2
mihyaeru21
0
290
WebエンジニアのためのMySQLデータ構造基礎 / mysql data structure for web developer
mihyaeru21
1
680
WebエンジニアのためのMySQL入門 / learning mysql for web developer
mihyaeru21
7
2.6k
RxSwiftと愉快な仲間たち / RxSwift with Units
mihyaeru21
4
2.8k
RxSwiftでTwitterの ライブラリを作ってる話 / RxTwift
mihyaeru21
4
740
CrystalでTwitter botを作ってみた / Create a Twitter bot in Crystal
mihyaeru21
0
1.3k
Gotanda.pm #1
mihyaeru21
1
170
Other Decks in Technology
See All in Technology
対話型音声AIアプリケーションの信頼性向上の取り組み
ivry_presentationmaterials
3
1k
研究開発部メンバーの働き⽅ / Sansan R&D Profile
sansan33
PRO
3
18k
Microsoft Defender XDRで疲弊しないためのインシデント対応
sophiakunii
1
310
AIエージェントが書くのなら直接CloudFormationを書かせればいいじゃないですか何故AWS CDKを使う必要があるのさ
watany
18
7.6k
公開初日に Gemini CLI を試した話や FFmpeg と組み合わせてみた話など / Gemini CLI 初学者勉強会(#AI道場)
you
PRO
0
1.3k
推し書籍📚 / Books and a QA Engineer
ak1210
0
140
AWS 怖い話 WAF編 @fillz_noh #AWSStartup #AWSStartup_Kansai
fillznoh
0
130
セキュアな社内Dify運用と外部連携の両立 ~AIによるAPIリスク評価~
zozotech
PRO
0
120
Data Engineering Study#30 LT資料
tetsuroito
1
180
Maintainer Meetupで「生の声」を聞く ~講演だけじゃないKubeCon
logica0419
0
110
Digitization部 紹介資料
sansan33
PRO
1
4.5k
All About Sansan – for New Global Engineers
sansan33
PRO
1
1.2k
Featured
See All Featured
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Producing Creativity
orderedlist
PRO
346
40k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Making the Leap to Tech Lead
cromwellryan
134
9.4k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
340
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Docker and Python
trallard
45
3.5k
Become a Pro
speakerdeck
PRO
29
5.4k
Adopting Sorbet at Scale
ufuk
77
9.5k
Transcript
ೖ 3FBDUJWF9 /%4 PO @mihyaeru21 ஶ ϛώϟΤϧ༁ A library for
composing asynchronous and event-based programs by using observable sequences. ͟ ͬ ͘ Γ ൛
දࢴग़མͪ ※දࢴͷςΩετͱΞΠίϯ http://reactivex.io/ ΑΓ
ࣗݾհ w ϛώϟΤϧ!NJIZBFSV w ʮ3Y͍͍ͧʯ w ʮ4XJGU͍͍ͧʯ w ʮ,PUMJO͍͍ͧʯ
w Φϥ˓Ϧʔͷճ͠ऀͰͳ͍
3FBDUJWF9 w ུͯ͠3Y w IUUQSFBDUJWFYJP w 0CTFSWFSύλʔϯͷ֦ு w ͋ͳ͕ͨٻΊ͍ͯͨϦΞΫςΟϒϓϩάϥϛϯάೖ w
IUUQOJOKJOLVOIBUFOBCMPHDPNFOUSZJOUSPSYKB
Կ͕ྑ͍ʁ w ඇಉظॲཧΛྑ͍ײ͡ʹॻ͚Δ w ଟ͘ͷݴޠͰ࣮͞Ε͓ͯΓ൚༻తʹ͑Δ w υΩϡϝϯτ͕ʢଞݴޠ൛ΛؚΊΕʣ๛ w એݴతʹϓϩάϥϛϯάͰ͖Δ
ࠓ֮͑ͯ΄͍͜͠ͱ
Observable<T>
ཱͪҐஔ ճ ෳճ ಉظ T getData() Iterable<T> getData() ඇಉظ
Future<T> getData() Observable<T> getData() from http://reactivex.io/intro.html
0CTFSWBCMF w ΠϕϯτετϦʔϜ w छྨͷΠϕϯτ͕ྲྀΕͯ͘Δ w /FYU w &SSPS w
$PNQMFUF w ଟͷΦϖϨʔλʹΑΔॊೈੑ
ࢁ΄Ͳ͋ΔΦϖϨʔλ from http://reactivex.io/documentation/operators.html
ετϦʔϜ from http://rxmarbles.com/ ͜ͷҹʴϚʔϒϧ͕ͭͷ0CTFSWBCMF ͜ͷਤϚʔϒϧμΠΞάϥϜͱ͍͏
ετϦʔϜ from http://rxmarbles.com/ /FYUΠϕϯτ
ετϦʔϜ from http://rxmarbles.com/ $PNQMFUFΠϕϯτ
NBQετϦʔϜͷม from http://rxmarbles.com/ ͬͪ͜ม͞Εͨ0CTFSWBCMF
ΤϥʔΛѻ͏ྫ &SSPSΠϕϯτ from http://reactivex.io/documentation/operators/catch.html
ΤϥʔΛѻ͏ྫ from http://reactivex.io/documentation/operators/catch.html ΤϥʔΛѲΓͭͿͯ͠ɺࢦఆͨ͠Λྲྀ͢
3Y4XJGUͰͷදݱ let anotherStream = stream .catchErrorJustReturn(0) .map { $0
* 10 }
3Y.BSCMFT ಈ͔͠ͳ͕ΒࢼͤΔ
มΘ͔ͬͨ
ΠϕϯτΛर͏ʹʁ
subscribe
TVCTDSJCF w ߪಡ͢Δ w ֤ΠϕϯτʹରԠͨ͠ίʔϧόοΫΛࢦఆ͢Δ w ؔ w 0CTFSWFS5
TVCTDSJCF stream.catchErrorJustReturn(0) .map { $0 * 10 } .subscribe(
onNext: { value in print("onNext: \(value)") }, onError: { error in // この例ではエラーは流れてこない print("onError: \(error)") }, onCompleted: { print("onCompleted") } )
TVCTDSJCF w 0CTFSWBCMFTVCTDSJCFͨ͠ॠؒʹൃՐ͢Δ w "1*Λୟ͘Α͏ͳ0CTFSWBCMFͩͬͨ߹ɺ 0CTFSWBCMFͷΠϯελϯεΛ࡞ͬͨ࣌Ͱ ࣮ࡍͷಈ࡞Կߦ͍ͬͯͳ͍ w ʢ࣮ࡍʹɺTVCTDSJCF͠ͳͯ͘Πϕϯτ͕ਨΕྲྀ͞ΕΔ)PUͳ0CTFSWBCMFͱɺ ͦ͏Ͱͳ͍$PMEͳ0CTFSWBCMF͕͋Δ͕ࠓճׂѪ͢Δɻ͜ͷهࣄ͕ৄ͍͠
IUUQRJJUBDPNUP3JTPV1JUFNTGCGEBEʣ
0CTFSWBCMFࡶ·ͱΊ w Λෳྲྀͤͯ w ศརͳίϨΫγϣϯૢ࡞͕͍Ζ͍ΖͰ͖Δ w 1SPNJTF
ͪΐͬͱͬͯ
ίʔϧόοΫࠈʹ ͳΓͦ͏͡Όͳ͍ʁ
ඇಉظͷஞ࣮࣍ߦ fetchHoge().subscribeNext { res in fetchFuga(id: res.id).subscribeNext { res2
in fetchPiyo(key: res2.key).subscribeNext { res3 in // do something with res3... } } } TVCTDSJCF/FYUɺ/FYUΠϕϯτ͚ͩTVCTDSJCF͢Δͭ
ݟࣄʹίʔϧόοΫࠈ ʗ ?P? ʘ
qBU.BQ fetchHoge() .flatMap { fetchFuga(id: $0.id) } .flatMap {
fetchPiyo(key: $0.key) } .subscribeNext { res in // do something with res... }
qBU.BQ w NBQʹࣅ͍ͯΔ w ੜͷͰͳ͘ɺผͷ0CTFSWBCMFʹม͢Δ w ݩͷετϦʔϜ͔ΒͷΠϕϯτͷλΠϛϯάͰɺ ผͷετϦʔϜ͕ൃՐͯ͠ɺͦͷΠϕϯτ͕ྲྀΕΔ w TVCTDSJCFͷதͰTVCTDSJCFͨ͘͠ͳͬͨΒ
qBU.BQͷग़൪Ͱ͋ΔՄೳੑ͕ඇৗʹߴ͍
·ͱΊ w 3Y0CTFSWBCMFΛத৺ͱͨ͠ ඇಉظετϦʔϜϥΠϒϥϦ w 0CTFSWBCMFͷΠϕϯτΛड͚औΔʹTVCTDSJCF w ͨ͘͞Μ͋ΔΦϖϨʔλͰॊೈͳهड़͕Ͱ͖Δ w ஞ࣮࣍ߦqBU.BQͰεοΩϦ