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
united airlines ™®️ USA Contact Numbers: Complete 2025 Support Guide
flyunitedhelp
1
340
開発生産性を組織全体の「生産性」へ! 部門間連携の壁を越える実践的ステップ
sudo5in5k
2
7.2k
整頓のジレンマとの戦い〜Tidy First?で振り返る事業とキャリアの歩み〜/Fighting the tidiness dilemma〜Business and Career Milestones Reflected on in Tidy First?〜
bitkey
2
16k
Delegating the chores of authenticating users to Keycloak
ahus1
0
140
american aa airlines®️ USA Contact Numbers: Complete 2025 Support Guide
aaguide
0
150
第4回Snowflake 金融ユーザー会 Snowflake summit recap
tamaoki
1
280
Flutter向けPDFビューア、pdfrxのpdfium WASM対応について
espresso3389
0
130
「クラウドコスト絶対削減」を支える技術—FinOpsを超えた徹底的なクラウドコスト削減の実践論
delta_tech
4
170
Tokyo_reInforce_2025_recap_iam_access_analyzer
hiashisan
0
190
怖くない!はじめてのClaude Code
shinya337
0
400
AI時代の開発生産性を加速させるアーキテクチャ設計
plaidtech
PRO
3
160
CDKTFについてざっくり理解する!!~CloudFormationからCDKTFへ変換するツールも作ってみた~
masakiokuda
1
150
Featured
See All Featured
A better future with KSS
kneath
238
17k
How to train your dragon (web standard)
notwaldorf
95
6.1k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Adopting Sorbet at Scale
ufuk
77
9.5k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Into the Great Unknown - MozCon
thekraken
40
1.9k
Git: the NoSQL Database
bkeepers
PRO
430
65k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
Being A Developer After 40
akosma
90
590k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.5k
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
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