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RxSwift ίʔυϦʔσΟϯάͷצॴ @ࣾ಺RxSwiftษڧձ

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ͳΜͰίʔυಡΉඞཁ͕͋Δͷʁ https://speakerdeck.com/bricklife/rxswiftfalseobserveontosubscribeonwoli-jie-suru

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ͳΜͰίʔυಡΉඞཁ͕͋Δͷʁ • ެࣜυΩϡϝϯτ΍ RxMarblesͳͲυΩϡϝϯτ ͸ॆ࣮͍ͯ͠ΔΑ͏ʹݟ͑Δ͕ɺHotม׵΍Ϛϧν εϨουͳͲ͕ؔ܎͖ͯͨ࣌͠ͷڍಈ͸υΩϡϝ ϯτΛ௥͏͚ͩͰ͸ཧղ͢Δͷ͸೉͍͠ɻ • ·ͨɺRxSwiftಠࣗͷ֓೦΍OperatorͳͲɺ ReactiveXͷυΩϡϝϯτʹ͸ॻ͔Ε͍ͯͳ͍͜ͱ ΋গ͋͠Δɻ(DriverͳͲ…)

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͜ͷεϥΠυͰ͸ • ओʹOperatorͷ࣮૷Ͱ޿͘࢖ΘΕ͍ͯΔ֓೦ ΍ख๏Λઆ໌͠·͢ɻ • ͦͷ͋ͱͰ Hot / Cold ͳͲΛྫʹ͋͛ͯɺͲ ͏΍࣮ͬͯݱ͞Ε͍ͯΔͷ͔Λઆ໌͠·͢ɻ

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͜ͷεϥΠυͰ͸ • RxSwift͸ v2.5.0 (2016೥7݄࣌఺Ͱͷmaster) Λݟͯ·͢ɻ • ͨͿΜόʔδϣϯ1ܥ΍ࠓޙͷόʔδϣϯͰ΋ ௨༻͢Δ͔͸ෆ໌Ͱ͕͢ɺͨͿΜେ͖͘ζϨ Δ͜ͱ͸ແ͍ͱࢥ͍·͢ɻ

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צॴ ͦͷ1 Operatorʹ͓͚Δ ʮsourceʯ

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Sequence Map Filter ↑ Α͘Έ͔͚Δਤ

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Sequence Map Filter ↑ Α͘Έ͔͚Δਤ ίʔυ্͸Ͳ͏දݱ͞Ε͍ͯΔʁ

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filter

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filter ࣮ଶ͸Filterͱ͍͏Ϋϥε

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filter sourceͱͯ͠ɺfilterΛݺͼग़ͨ͠ ObservableΛ͍࣋ͬͯΔ

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map Map΋ಉ༷

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ͭ·Γ source Mapͷsource͸Sequence (Sequence͸Observable.ofͷ಺෦දݱ)

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ͭ·Γ source Filterͷsource͸Map

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ͭ·Γ source Sequence Map Filter source

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ͭ·Γ source Sequence Map Filter source sourceͷ࿈ͳΓͱ΋ݴ͑Δ

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ͱ͜ΖͰɺ source Sequence Map Filter source ͜Εͷsource͸ʁ

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createܥͷOperatorʹ͸source͸ͳ͍ • create, just, of, error, never ͳͲɺcreateܥͷ Operatorʹ͸source͸ͳ͍ɻ • map΍filterͷΑ͏ͳҰൠతͳOperator΍ɺ Hotม׵ܥɺsubscribeOn/observeOnʹ͸ source͕͋Δɻ

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createܥͷOperatorʹ͸source͸ͳ͍ • ͔͜͜Β͸ɺී௨ʹʮOperatorʯͱॻ͍͍ͯ ͨΒʮcreateܥҎ֎ͷOperatorʯͷ͜ͱͩͱ ࢥ͍ͬͯͩ͘͞ɻ

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source͸Ͳ͏࢖ΘΕΔͷʁ • source͸ཁ͸ObservableͳͷͰɺద౰ͳλΠ ϛϯάͰͦͷsourceΛ(಺෦తʹ) subscribe͠ ͯΠϕϯτΛड͚औΓ࢝Ί·͢ɻ • ͲͷλΠϛϯάͰ(಺෦తʹ)subscribe͕ݺ͹ ΕΔ͔͸ɺHot / ColdͳͲOperatorͷੑ࣭ʹ Αͬͯҧ͖ͬͯ·͢ɻ

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sourceʹ͍ͭͯ·ͱΊ • createܥҎ֎ͷOperator͸લͷObservableΛ sourceͱͯ࣋ͭ͜͠ͱͰɺਤͷΑ͏ͳ࿈ͳΓ Λ࣮ݱ͍ͯ͠Δɻ source Sequence Map Filter source

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צॴ ͦͷ2 Operator࣮૷Ͱ νΣοΫ͢΂͖఺

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ ҎԼ͸ͲͷOperatorʹ΋ڞ௨͢Δಈ͖ • ద౰ͳλΠϛϯάͰsourceΛsubscribe͢Δ • source͔Βड͚औͬͨΠϕϯτʹద౰ͳॲཧ ΛՃ͑ͯ࣍ʹྲྀ͢

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ Sequence Map Filter Observer subscribe

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ subscribe Sequence Map Filter Observer subscribe subscribe ಺෦తʹsourceΛsubscribe͢Δ

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ Sequence Map Filter Observer on on on ΠϕϯτΛड͚औͬͯॲཧΛՃ͑ͯ࣍ʹྲྀ͢

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ subscribe Sequence Map Filter Observer subscribe subscribe on on on

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Operatorͷ࣮૷ͰͳʹΛΈΔ͔ ΈΔϙΠϯτ͸3ͭ • ͍ͭsourceͷsubscribeΛߦ͏͔ • subscribe͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔ • on͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔

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ྫ: Filter

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ྫ: Filter run͸subscribe͕ݺ͹Εͨͱ͖ʹݺ͹ΕΔϝιου

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ྫ: Filter sinkͱ͔͍͏΍͕ͭsourceͷsubscribeΛߦ͍ͬͯΔ

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ྫ: Filter Sequence Map Filter Observer subscribe ͭ·Γɺࣗ਎ͷsubscribe͕ݺ͹ΕͨΒ

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ྫ: Filter Sequence Map Filter Observer subscribe subscribe sourceͷsubscribeΛߦ͏

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ྫ: Filter

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ྫ: Filter on͸source͔ΒΠϕϯτ͕ྲྀΕ͖ͯͨ࣌ʹݺ͹ΕΔϝιου

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ྫ: Filter Nextͷ৔߹͸

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ྫ: Filter ൑ఆ༻ͷؔ਺ʹ஋Λ౉ͯ͠

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ྫ: Filter ৚݅Λຬ͍ͨͯ͠Ε͹࣍΁ྲྀ͢

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ྫ: Filter Sequence Map Filter Observer on source͔ΒΠϕϯτ͕དྷͨΒ

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ྫ: Filter Sequence Map Filter Observer on on ൑ఆͨ͠ޙ࣍΁౉͢

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ಡΊΔʂ ✌('ω'✌ )ࡾ✌('ω')✌ࡾ( ✌'ω')✌

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·ͱΊ ΈΔϙΠϯτ͸3ͭ • ͍ͭsourceͷsubscribeΛߦ͏͔ • subscribe͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔ • on͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔

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Subject͸… ಉ͘͡3ͭΛΈΔͱڍಈ͕͔ͭΊΔͱࢥ͍·͢ɻ • ͍ͭsourceͷsubscribeΛߦ͏͔ • subscribe͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔ • on͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔

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createܥͷOperator͸… ͱΓ͋͑ͣɺ • subscribe͕ݺ͹ΕͨΒͳʹ͕ى͜Δ͔ ͜ΕΛݟ͓͚ͯ͹ڍಈ͕Θ͔Δͱࢥ͍·͢ɻ

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צॴ ͦͷ3 Sink / SinkIter

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(෮श) Operatorͷಈ͖ • ద౰ͳλΠϛϯάͰsourceΛsubscribe͢Δ • source͔Βड͚औͬͨΠϕϯτʹద౰ͳॲཧ ΛՃ͑ͯ࣍ʹྲྀ͢

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(෮श) Operatorͷಈ͖ • ద౰ͳλΠϛϯάͰsourceΛsubscribe͢Δ • source͔Βड͚औͬͨΠϕϯτʹద౰ͳॲཧ ΛՃ͑ͯ࣍ʹྲྀ͢ ୭͕subscribe͢Δͷʁobserver͸୭ʁ

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Filter

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Filter

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Filter

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Sink

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Sinkͱ͸ʁ • (಺෦తʹ)sourceͷobserverʹͳΔ΍ͭ • Filterʹ͸FilterSinkɺMapʹ͸MapSinkɺͷΑ ͏ʹ΄΅શͯͷOperatorʹରͯ̋̋͠Sink͕ ଘࡏ͢Δ

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಺෦తͳಈ͖ (subscribe࣌)

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Sequence Map Filter Observer

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Filter Sequence Map Filter Observer subscribe͕ݺ͹ΕͨΒrun͕ݺ͹ΕΔ subscribe(observer)

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Filter Sequence Map Filter Observer subscribe(observer) observer͕ͦͷ··౉͞ΕΔ

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Filter Sequence Map Filter Observer observerΛݩʹFilterSink͕࡞ΒΕΔ FilterSink(observer)

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Filter Sequence Map Filter Observer FilterSink͕sourceΛsubscribe͢Δ source.subscribe(FilterSink(observer))

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Map Sequence Map Filter Observer source.subscribe(FilterSink(observer))

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Map Sequence Map Filter Observer source.subscribe(FilterSink(observer)) observerͱͯ͠ɺFilterSink(observer)͕౉ͬͯ͘Δɻ

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Map Sequence Map Filter Observer MapSink(FilterSink(observer)) observerΛݩʹFilterSink͕࡞ΒΕΔ

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Map Sequence Map Filter Observer source.subscribe(MapSink(FilterSink(observer))) MapSink͕sourceΛsubscribe͢Δ

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಺෦తͳಈ͖ (on࣌)

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MapSink Sequence Map Filter Observer Πϕϯτ͕ૹग़͞ΕΔ MapSink(FilterSink(observer)).on(.Next(2))

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MapSink Sequence Map Filter Observer Πϕϯτ͕selectorʹΑͬͯม׵͞ΕΔ .Next(2) → .Next(4)

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MapSink Sequence Map Filter Observer Πϕϯτ͕ૹग़͞ΕΔ FilterSink(observer).on(.Next(4))

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FilterSink Sequence Map Filter Observer Πϕϯτ͕ૹग़͞ΕΔ FilterSink(observer).on(.Next(4))

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FilterSink Sequence Map Filter Observer ৚݅νΣοΫ͞ΕΔ value % 4 == 0

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FilterSink Sequence Map Filter Observer Πϕϯτ͕ૹग़͞ΕΔ observer.on(.Next(4))

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ಡΊΔʂ ✌('ω'✌ )ࡾ✌('ω')✌ࡾ( ✌'ω')✌

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·ͱΊ subscribe(MapSink(FilterSink(observer))) Sequence Map Filter Observer subscribe(FilterSink(observer)) subscribe(observer) observerΛSinkʹแΈͳ͕Β sourceΛsubscribe

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·ͱΊ Sequence Map Filter Observer observer.on(.Next) FilterSink(observer).on(.Next) MapSink(FilterSink(observer)).on(.Next) SinkͰॲཧΛՃ͑ͳ͕Β observerʹΠϕϯτΛྲྀ͢

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SinkIter

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SinkIterͱ͸ʁ • merge΍flatMapͳͲɺ(গͳ͘ͱ΋಺෦తʹ) Observable> Λѻ͏ͱ͖ʹ ར༻͞ΕΔɻ

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SinkIterͱ͸ʁ Observable>

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SinkIterͱ͸ʁ Observable> ֎ଆͷObservableΛ subscribe͢Δͷ͕Sink

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SinkIterͱ͸ʁ Observable> ಺ଆͷObservableΛ subscribe͢Δͷ͕SinkIter

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ಡΜͰΈΑ͏ ColdͳObservable

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ColdͳObservableͷੑ࣭ • ͍͔ͭ͋͘Γ·͕͢ɺࠓճ͸ʮsubscribe͠ͳ ͍ͱಈ࡞͠ͳ͍ʯͱ͍͏ੑ࣭͕ίʔυϨϕϧ ͰͲ͏࣮ݱ͞Ε͍ͯΔ͔Λ֬ೝͯ͠Έ·͢ɻ • ݴ͍͔͑Ε͹ʮsubscribe͞Εͨͱ͖ʹಈ࡞Λ ࢝ΊΔʯͰ͢ɻ

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Just

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Just subscribe͞ΕΔͱ….

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Just ஋͕ૹग़͞ΕΔʂʂʂ

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Cold

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Cold subscribe Just Map Filter Observer subscribe subscribe on on on

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ಡΜͰΈΑ͏ BehaviorSubject

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BehaviorSubjectͷੑ࣭ • ͍͔ͭ͋͘Γ·͕͢ɺࠓճ͸ʮ෼ذͰ͖Δʯ ʮsubscribe࣌ʹ௚લͷ஋͕औΕΔʯΛ֬ೝ͠ ͯΈ·͢ɻ

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BehaviorSubject ௚લͷ஋Λอ࣋͢Δม਺

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BehaviorSubject ෳ਺ͷobserver

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BehaviorSubject subscribe͞ΕͨΒݺ͹ΕΔ

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BehaviorSubject subscribe͞ΕͨΒobserverͱͯ͠ొ࿥

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BehaviorSubject ௚લͷ஋Λૹग़

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BehaviorSubject onͰΠϕϯτΛड͚औͬͨͱ͖ʹݺ͹ΕΔ

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BehaviorSubject ௚લͷ஋Λߋ৽

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BehaviorSubject ֤Observerʹૹग़

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ಡΊΔʂ ✌('ω'✌ )ࡾ✌('ω')✌ࡾ( ✌'ω')✌

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·ͱΊ • Rxʹ͸ଟ͘ͷOperator͕༻ҙ͞Ε͍ͯ·͢ ͕ɺͦΕΒ͸΄΅ಉ͡࡞Γʹͳ͓ͬͯΓɺಡ Έํ͑͞෼͔Ε͹؆୯ʹڍಈΛ֬ೝ͢Δ͜ͱ ͕Ͱ͖·͢ɻ • ڍಈʹࣗ਎͕ͳ͚Ε͹ιʔεΛಡΜͰ֬ೝ͠ Α͏ʂ

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