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。

Transcript

1. K2VFSZ͔ΒεςʔδΞοϓ
   ̍าઌߦͨ͘Ίͷ+BWB4DSJQU ੢ാҰഅ to-R 3Y+4Ͱ࢝ΊΔϦΞΫςΟϒϓϩάϥϛϯά ੢ാҰഅ
2. גࣜձࣾτΡʔΞʔϧ
   ୅දऔక໾
   
   ϑϩϯτΤϯυΤϯδχΞ
   ੢ാҰഅ גࣜձࣾτΡʔΞʔϧ
   ୅දऔక໾
   
   ϑϩϯτΤϯυΤϯδχΞ
   ੢ാҰഅ
3. ϑϩϯτΤϯυʹಛԽͨ͠8FC੍࡞ձࣾ w )5.-
   
   $44
   w K2VFSZ
   
   +BWB4DSJQU
   w "OHVMBS
   
   
   3FBDU
   
   7VF
   w ςΫχΧϧσΟϨΫγϣϯ to-R
4. גࣜձࣾτΡʔΞʔϧ
   ୅දऔక໾
   
   ϑϩϯτΤϯυΤϯδχΞ
   ੢ാҰഅ
5. גࣜձࣾτΡʔΞʔϧ
   ୅දऔక໾
   
   ϑϩϯτΤϯυΤϯδχΞ
   ੢ാҰഅ
6. https://www.to-r.net/media/react-tutorial/
7. https://www.to-r.net/media/react-tutorial/ ࠷ۙͷ͓࢓ࣄ͸΄ͱΜͲ"OHVMBS
8. 3Y+4 ຊ೔ͷςʔϚ
9. const button = document.querySelector('button'); button.addEventListener('click', () => { console.log('Clicked!') }); +BWB4DSJQU
10. 3Y+4 var button = document.querySelector('button'); Rx.Observable.fromEvent(button, 'click') .subscribe(() => { console.log('Clicked!') });
11. $('button:first').click( () => { console.log('Clicked!'); }); K2VFSZ
12. +BWB4DSJQU [1, 2, 3, 4, 5, 6, 7, 8] .map(val => val*2) .forEach(val => { console.log(val) });
13. 3Y+4 Rx.Observable.from([1, 2, 3, 4, 5, 6, 7, 8]) .map(val => val*2) .subscribe(val => { console.log(val); });
14. ͜Μͳʹศརͳ໋ྩ͕
    छྨ΄Ͳ༻ҙ͞Ε͍ͯΔ
15. https://www.learnrxjs.io/
16. 3Y+4ʹର͢ΔϑΝʔετΠϯϓϨογϣϯ wͳʹ͕ศར͔Θ͔Βͳ͍
    w֮͑Δ͜ͱଟ͍
    w഑ྻ͕ετϦʔϜ
    wK2VFSZศར
    ҧ͏
17. 3Y+4ͷར఺͸
    ͋Δఔ౓࢖͍͜ͳ͞ͳ͍ͱ
    ݟ͑ͯ͜ͳ͍
18. https://polipoliweb.com/blog/shinjin-kyouiku/
19. ؓ࿩ٳ୊
20. 3Y+4Λཧղ͢ΔͨΊͷͭͷϙΠϯτ wඇಉظ
    wϦΞΫςΟϒ
    wσʔλετΞ
21. ඇಉظ
22. ඇಉظ
23. ඇಉظ ͍ͭ࢝·Δ͔Θ͔Βͳ͍͠ɺ ऴΘΔλΠϛϯά΋୲อ͞Ε͍ͯͳ͍
24. ඇಉظ ෳ਺ͷॲཧ͕ऴΘͬͨλΠϛϯάͰԿ͔͍ͨ͠
25. 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
26. 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
27. ඇಉظ Կ͔ͷॲཧ͕ऴΘͬͨλΠϛϯάͰԿ͔͍ͨ͠
28. 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
29. 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
30. ϦΞΫςΟϒ
31. ϦΞΫςΟϒ ετϦʔϜͷ஋ʹԠͯ͡ ॲཧΛ࣮ߦ͢Δ ʢݫີͳఆٛͰ͸ͳ͋͘͘·ͰRxJSΛཧղ͢Δ্ͷ֓೦ͱͯ͠ʣ
32. ϦΞΫςΟϒ 0CFSWBCMF 0CTFSWFS
33. ϦΞΫςΟϒ 0CFSWBCMF 0CTFSWFS ஋͕มΘͬͨ͜ͱΛ఻͑Δ ஋͕มΘͬͨΒ࣮ߦ ɹߪಡ
34. ϦΞΫςΟϒ const sub = new Rx.BehaviorSubject(0); sub.subscribe( res => { console.log(res); }); window.addEventListener('click', () => { sub.next(sub.value + 1); });
35. 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
36. 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
37. wΞΠςϜΛ௥Ճ
    w૯਺ΛมԽ
    wϖʔδϯάΛมԽ 41"Ͱ͸ͭͷ৘ใมߋͰ୔ࢁͷॲཧ͕ඞཁʹͳΔ 50%0Ϧετʹ
    ৽نΞΠςϜΛ
    ௥Ճ
38. σʔλετΞ
39. σʔλετΞ AngularͷίʔυͰগ͠۩ମతʹ
40. "OHVMBS $PNQPOFOU $PNQPOFOU 4FSWJDF
41. @Injectable() export class CountService { public count = new Rx.BehaviorSubject(0); increment() { this.count.next(this.count.value + 1); } } "OHVMBS αʔϏε
42. 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
43. VOTVCTDSJCF͸๨Εͣʹ
44. 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
45. "OHVMBSͷ
    BTZODύΠϓ͕ศར
46. export class CountComponent implements OnInit { count: Observable<number>; constructor( private countService: CountService ) { } ngOnInit() { this.count = this.countService.count; } increment() { this.countService.increment(); } } "OHVMBS ίϯϙʔωϯτ
47. <p>{{count | async}}</p> <button (click)="increment()">click</button> "OHVMBS ςϯϓϨʔτ
48. ݁࿦
49. ศརͰ͢ΑͶ
50. 5IBOL
    :PV