入門ReactiveX / about ReactiveX

Transcript

1. ೖ໳ 3FBDUJWF9 /%4 PO
    @mihyaeru21 ஶ ϛώϟΤϧ
   
   ༁ A library for composing asynchronous and event-based programs by using observable sequences. ͟ ͬ ͘ Γ ൛
2. දࢴग़མͪ ※දࢴͷςΩετͱΞΠίϯ͸ http://reactivex.io/ ΑΓ
3. ࣗݾ঺հ w ϛώϟΤϧ
   !NJIZBFSV
   
   w ʮ3Y͸͍͍ͧʯ
   w ʮ4XJGU͸͍͍ͧʯ
   w ʮ,PUMJO͸͍͍ͧʯ
   w Φϥ˓Ϧʔͷճ͠ऀͰ͸ͳ͍ 
4. 3FBDUJWF9 w ུͯ͠
   3Y
   w IUUQSFBDUJWFYJP
   w 0CTFSWFSύλʔϯͷ֦ு
   w ͋ͳ͕ͨٻΊ͍ͯͨϦΞΫςΟϒϓϩάϥϛϯάೖ໳
   w IUUQOJOKJOLVOIBUFOBCMPHDPNFOUSZJOUSPSYKB 
5. Կ͕ྑ͍ʁ w ඇಉظॲཧΛྑ͍ײ͡ʹॻ͚Δ
   w ଟ͘ͷݴޠͰ࣮૷͞Ε͓ͯΓ൚༻తʹ࢖͑Δ
   w υΩϡϝϯτ͕ʢଞݴޠ൛ΛؚΊΕ͹ʣ๛෋
   w એݴతʹϓϩάϥϛϯάͰ͖Δ 
6. ࠓ೔֮͑ͯ΄͍͜͠ͱ
7. Observable<T>
8. ཱͪҐஔ  ճ ෳ਺ճ ಉظ T getData() Iterable<T> getData() ඇಉظ Future<T> getData() Observable<T> getData() from http://reactivex.io/intro.html
9. 0CTFSWBCMF w ΠϕϯτετϦʔϜ
   w छྨͷΠϕϯτ͕ྲྀΕͯ͘Δ
   w /FYU
   w &SSPS
   w $PNQMFUF
   w ଟ਺ͷΦϖϨʔλʹΑΔॊೈੑ 
10. ࢁ΄Ͳ͋ΔΦϖϨʔλ  from http://reactivex.io/documentation/operators.html
11. ετϦʔϜ  from http://rxmarbles.com/ ͜ͷ໼ҹʴϚʔϒϧ͕ͭͷ0CTFSWBCMF ͜ͷਤ͸ϚʔϒϧμΠΞάϥϜͱ͍͏
12. ετϦʔϜ  from http://rxmarbles.com/ /FYUΠϕϯτ
13. ετϦʔϜ  from http://rxmarbles.com/ $PNQMFUFΠϕϯτ
14. NBQ͸ετϦʔϜͷม׵  from http://rxmarbles.com/ ͬͪ͜͸ม׵͞Εͨ0CTFSWBCMF
15. ΤϥʔΛѻ͏ྫ  &SSPSΠϕϯτ from http://reactivex.io/documentation/operators/catch.html
16. ΤϥʔΛѻ͏ྫ  from http://reactivex.io/documentation/operators/catch.html ΤϥʔΛѲΓͭͿͯ͠ɺࢦఆͨ͠஋Λྲྀ͢
17. 3Y4XJGUͰͷදݱ  let anotherStream = stream .catchErrorJustReturn(0) .map { $0 * 10 }
18. 3Y.BSCMFT  ಈ͔͠ͳ͕ΒࢼͤΔ
19. ม׵͸Θ͔ͬͨ
20. ΠϕϯτΛर͏ʹ͸ʁ
21. subscribe
22. TVCTDSJCF w ߪಡ͢Δ
    w ֤ΠϕϯτʹରԠͨ͠ίʔϧόοΫΛࢦఆ͢Δ
    w ؔ਺
    w 0CTFSWFS5 
23. 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") } )
24. TVCTDSJCF w 0CTFSWBCMF͸TVCTDSJCFͨ͠ॠؒʹൃՐ͢Δ
    w "1*Λୟ͘Α͏ͳ0CTFSWBCMFͩͬͨ৔߹ɺ
 0CTFSWBCMFͷΠϯελϯεΛ࡞ͬͨ࣌఺Ͱ͸
 ࣮ࡍͷಈ࡞͸Կ΋ߦ͍ͬͯͳ͍
    w ʢ࣮ࡍʹ͸ɺTVCTDSJCF͠ͳͯ͘΋Πϕϯτ͕ਨΕྲྀ͞ΕΔ)PUͳ0CTFSWBCMFͱɺ ͦ͏Ͱͳ͍$PMEͳ0CTFSWBCMF͕͋Δ͕ࠓճ͸ׂѪ͢Δɻ
    ͜ͷهࣄ͕ৄ͍͠
    IUUQRJJUBDPNUP3JTPV1JUFNTGCGEBE
    ʣ 
25. 0CTFSWBCMFࡶ·ͱΊ w ஋Λෳ਺ྲྀͤͯ
    w ศརͳίϨΫγϣϯૢ࡞͕͍Ζ͍ΖͰ͖Δ
    w 1SPNJTF 
26. ͪΐͬͱ଴ͬͯ
27. ίʔϧόοΫ஍ࠈʹ
 ͳΓͦ͏͡Όͳ͍ʁ
28. ඇಉظͷஞ࣮࣍ߦ  fetchHoge().subscribeNext { res in fetchFuga(id: res.id).subscribeNext { res2 in fetchPiyo(key: res2.key).subscribeNext { res3 in // do something with res3... } } } TVCTDSJCF/FYU͸ɺ/FYUΠϕϯτ͚ͩTVCTDSJCF͢Δ΍ͭ
29. ݟࣄʹίʔϧόοΫ஍ࠈ
    ʗ ?P? ʘ
30. qBU.BQ  fetchHoge() .flatMap { fetchFuga(id: $0.id) } .flatMap { fetchPiyo(key: $0.key) } .subscribeNext { res in // do something with res... }
31. qBU.BQ w NBQʹࣅ͍ͯΔ
    w ੜͷ஋Ͱ͸ͳ͘ɺผͷ0CTFSWBCMFʹม׵͢Δ
    w ݩͷετϦʔϜ͔ΒͷΠϕϯτͷλΠϛϯάͰɺ
 ผͷετϦʔϜ͕ൃՐͯ͠ɺͦͷΠϕϯτ͕ྲྀΕΔ
    w TVCTDSJCFͷதͰTVCTDSJCFͨ͘͠ͳͬͨΒ
 qBU.BQͷग़൪Ͱ͋ΔՄೳੑ͕ඇৗʹߴ͍ 
32. ·ͱΊ w 3Y͸0CTFSWBCMFΛத৺ͱͨ͠
 ඇಉظετϦʔϜϥΠϒϥϦ
    w 0CTFSWBCMFͷΠϕϯτΛड͚औΔʹ͸TVCTDSJCF
    w ͨ͘͞Μ͋ΔΦϖϨʔλͰॊೈͳهड़͕Ͱ͖Δ
    w ஞ࣮࣍ߦ͸qBU.BQͰεοΩϦ