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
RxJSで始めるリアクティブプログラミング
Search
Kazuma Nishihata
November 18, 2017
Programming
1
1.7k
RxJSで始めるリアクティブプログラミング
「秋のJavaScript祭 in mixi 2017」で発表したスライドです。
Kazuma Nishihata
November 18, 2017
Tweet
Share
More Decks by Kazuma Nishihata
See All by Kazuma Nishihata
フロントエンドの技術選定
kazumanishihata
6
6.6k
Vue with TypeScript
kazumanishihata
0
1.8k
ころばぬ先のテクニカルディレクション
kazumanishihata
1
600
動きのデザインとフロントエンドの連携
kazumanishihata
2
1.6k
まぼろしのJS勉強会 #2 「細かすぎて伝わらないUI実装選手権」『使えそうで使えないけど使いたい IntersectionObserver』
kazumanishihata
1
380
WP REST APIとReactで作るSPA
kazumanishihata
2
9.7k
ぼくらのCONST戦争 SCRIPTY #5
kazumanishihata
2
3.4k
Other Decks in Programming
See All in Programming
Six and a half ridiculous things to do with Quarkus
hollycummins
0
140
開発生産性を上げるための生成AI活用術
starfish719
3
290
複雑化したリポジトリをなんとかした話 pipenvからuvによるモノレポ構成への移行
satoshi256kbyte
1
970
ポスターセッション: 「まっすぐ行って、右!」って言ってラズパイカーを動かしたい 〜生成AI × Raspberry Pi Pico × Gradioの試作メモ〜
komofr
0
1.2k
CI_CD「健康診断」のススメ。現場でのボトルネック特定から、健康診断を通じた組織的な改善手法
teamlab
PRO
0
200
ネイティブ製ガントチャートUIを作って学ぶUICollectionViewLayoutの威力
jrsaruo
0
140
XP, Testing and ninja testing ZOZ5
m_seki
3
520
Go言語の特性を活かした公式MCP SDKの設計
hond0413
1
200
止められない医療アプリ、そっと Swift 6 へ
medley
1
140
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
7
1.6k
GitHub Actions × AWS OIDC連携の仕組みと経緯を理解する
ota1022
0
250
Your Perfect Project Setup for Angular @BASTA! 2025 in Mainz
manfredsteyer
PRO
0
150
Featured
See All Featured
Why Our Code Smells
bkeepers
PRO
339
57k
Mobile First: as difficult as doing things right
swwweet
224
10k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
189
55k
How STYLIGHT went responsive
nonsquared
100
5.8k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
Designing Experiences People Love
moore
142
24k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
36
2.5k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
32
2.2k
Raft: Consensus for Rubyists
vanstee
139
7.1k
Transcript
K2VFSZ͔ΒεςʔδΞοϓ ̍าઌߦͨ͘Ίͷ+BWB4DSJQU ാҰഅ to-R 3Y+4Ͱ࢝ΊΔϦΞΫςΟϒϓϩάϥϛϯά ാҰഅ
גࣜձࣾτΡʔΞʔϧ දऔకϑϩϯτΤϯυΤϯδχΞ ാҰഅ גࣜձࣾτΡʔΞʔϧ දऔకϑϩϯτΤϯυΤϯδχΞ ാҰഅ
ϑϩϯτΤϯυʹಛԽͨ͠8FC੍࡞ձࣾ w )5.-$44 w K2VFSZ+BWB4DSJQU w "OHVMBS3FBDU7VF w ςΫχΧϧσΟϨΫγϣϯ to-R
גࣜձࣾτΡʔΞʔϧ දऔకϑϩϯτΤϯυΤϯδχΞ ാҰഅ
גࣜձࣾτΡʔΞʔϧ දऔకϑϩϯτΤϯυΤϯδχΞ ാҰഅ
https://www.to-r.net/media/react-tutorial/
https://www.to-r.net/media/react-tutorial/ ࠷ۙͷ͓ࣄ΄ͱΜͲ"OHVMBS
3Y+4 ຊͷςʔϚ
const button = document.querySelector('button'); button.addEventListener('click', () => { console.log('Clicked!') });
+BWB4DSJQU
3Y+4 var button = document.querySelector('button'); Rx.Observable.fromEvent(button, 'click') .subscribe(() => {
console.log('Clicked!') });
$('button:first').click( () => { console.log('Clicked!'); }); K2VFSZ
+BWB4DSJQU [1, 2, 3, 4, 5, 6, 7, 8] .map(val
=> val*2) .forEach(val => { console.log(val) });
3Y+4 Rx.Observable.from([1, 2, 3, 4, 5, 6, 7, 8]) .map(val
=> val*2) .subscribe(val => { console.log(val); });
͜Μͳʹศརͳ໋ྩ͕ छྨ΄Ͳ༻ҙ͞Ε͍ͯΔ
https://www.learnrxjs.io/
3Y+4ʹର͢ΔϑΝʔετΠϯϓϨογϣϯ wͳʹ͕ศར͔Θ͔Βͳ͍ w֮͑Δ͜ͱଟ͍ wྻ͕ετϦʔϜ wK2VFSZศར ҧ͏
3Y+4ͷར ͋Δఔ͍͜ͳ͞ͳ͍ͱ ݟ͑ͯ͜ͳ͍
https://polipoliweb.com/blog/shinjin-kyouiku/
ؓٳ
3Y+4Λཧղ͢ΔͨΊͷͭͷϙΠϯτ wඇಉظ wϦΞΫςΟϒ wσʔλετΞ
ඇಉظ
ඇಉظ
ඇಉظ ͍ͭ࢝·Δ͔Θ͔Βͳ͍͠ɺ ऴΘΔλΠϛϯά୲อ͞Ε͍ͯͳ͍
ඇಉظ ෳͷॲཧ͕ऴΘͬͨλΠϛϯάͰԿ͔͍ͨ͠
ඇಉظ const streamA = Rx.Observable.of('A').delay(1000); const streamB = Rx.Observable.of('B').delay(500); const
streamC = Rx.Observable.of('C').delay(1500); Rx.Observable.forkJoin( streamA, streamB, streamC ).subscribe( data => console.log(data[0], data[1], data[2]) ); 3Y+4
ඇಉظ const proA = new Promise( resolve => setTimeout(resolve, 1000,
"A") ); const proB = new Promise( resolve => setTimeout(resolve, 500, "B") ); const proC = new Promise( resolve => setTimeout(resolve, 1500, "C") ); Promise.all([proA, proB, proC]) .then(data => console.log(data[0], data[1], data[2])); +BWB4DSJQU
ඇಉظ Կ͔ͷॲཧ͕ऴΘͬͨλΠϛϯάͰԿ͔͍ͨ͠
ඇಉظ const streamA = Rx.Observable.of('A').delay(1000); const streamB = Rx.Observable.of('B').delay(500); const
combine = streamA.map(() => { console.log('Finish A'); return streamB }).concatAll(); combined.subscribe(() => console.log('Finish B')); 3Y+4
ඇಉظ const proA = () => new Promise( resolve =>
setTimeout(resolve, 1000, "A") ); const proB = () => new Promise( resolve => setTimeout(resolve, 500, "B") ); ( async () => { await proA(); console.log('Finish A'); await proB(); console.log('Finish B'); } )(); +BWB4DSJQU
ϦΞΫςΟϒ
ϦΞΫςΟϒ ετϦʔϜͷʹԠͯ͡ ॲཧΛ࣮ߦ͢Δ ʢݫີͳఆٛͰͳ͋͘͘·ͰRxJSΛཧղ͢Δ্ͷ֓೦ͱͯ͠ʣ
ϦΞΫςΟϒ 0CFSWBCMF 0CTFSWFS
ϦΞΫςΟϒ 0CFSWBCMF 0CTFSWFS ͕มΘͬͨ͜ͱΛ͑Δ ͕มΘͬͨΒ࣮ߦ ɹߪಡ
ϦΞΫςΟϒ const sub = new Rx.BehaviorSubject(0); sub.subscribe( res => {
console.log(res); }); window.addEventListener('click', () => { sub.next(sub.value + 1); });
ϦΞΫςΟϒ const sub = new Rx.BehaviorSubject(0); sub.subscribe( res => {
console.log(res); }); window.addEventListener('click', () => { sub.next(sub.value + 1); }); ߪಡ ͕มΘͬͨΒ࣮ߦ ͕มΘͬͨ͜ͱΛ ڭ͑Δ
ϦΞΫςΟϒ const sub = new Rx.BehaviorSubject(0); sub.subscribe( res => {
console.log(1, res); }); sub.subscribe( res => { console.log(2, res); }); window.addEventListener('click', () => { sub.next(sub.value + 1); }); ॲཧA ॲཧB
wΞΠςϜΛՃ w૯ΛมԽ wϖʔδϯάΛมԽ 41"ͰͭͷใมߋͰࢁͷॲཧ͕ඞཁʹͳΔ 50%0Ϧετʹ ৽نΞΠςϜΛ Ճ
σʔλετΞ
σʔλετΞ AngularͷίʔυͰগ͠۩ମతʹ
"OHVMBS $PNQPOFOU $PNQPOFOU 4FSWJDF
@Injectable() export class CountService { public count = new Rx.BehaviorSubject(0);
increment() { this.count.next(this.count.value + 1); } } "OHVMBS αʔϏε
export class CountComponent implements OnInit { count: number; constructor( private
countService: CountService ) { } ngOnInit() { this.countService.count.subscribe( res => { this.count = res; }); } increment() { this.countService.increment(); } } "OHVMBS ίϯϙʔωϯτ
VOTVCTDSJCFΕͣʹ
export class CountComponent implements OnInit, OnDestroy { count: number; subscription:
Subscription; constructor( private countService: CountService ) { } ngOnInit() { const sub = this.countService.count.subscribe( res => { this.count = res; }); this.subscription.add(sub); } ngOnDestroy() { this.subscription.unsubscribe(); } increment() { this.countService.increment(); } } "OHVMBS ίϯϙʔωϯτ
"OHVMBSͷ BTZODύΠϓ͕ศར
export class CountComponent implements OnInit { count: Observable<number>; constructor( private
countService: CountService ) { } ngOnInit() { this.count = this.countService.count; } increment() { this.countService.increment(); } } "OHVMBS ίϯϙʔωϯτ
<p>{{count | async}}</p> <button (click)="increment()">click</button> "OHVMBS ςϯϓϨʔτ
݁
ศརͰ͢ΑͶ
5IBOL:PV