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Trying State Manegemant without Redux(updated)
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Nokogiri
October 25, 2019
Programming
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1.4k
Trying State Manegemant without Redux(updated)
Reduxを利用せずに、React の Context と Hooksで状態管理してみる話
Nokogiri
October 25, 2019
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Transcript
Trying StateManagement without Redux updated
Taiki Nishi kintone։ൃνʔϜ ɾϑϩϯτόοΫΤϯυ ɾि̍ͰSlashνʔϜ ɾwww.nkgr.app ɾझຯɿ೫ࡔ46 ɹɹ Nokogiri(@nkgrnkgr)
ReduxΛར༻ͤͣʹɺ React ͷ Context ͱ HooksͰ ঢ়ଶཧͯ͠ΈΔ ͱ͍͏
Redux is Կʁ ɾϞμϯͳJSΞϓϦͷෳࡶͳঢ়ଶཧΛ༧ଌՄೳʹ͢Δػߏ ɾ୯Ұσʔλϑϩʔ View͔Βൃߦ͞ΕͨActionΛDispacherͰॲཧ͠ɺReducer͕Actionͱݱࡏͷ StateΛݩʹ৽͍͠StateΛฦ͢ ɾActionΛ࣮ߦ͢Δ͜ͱͰͲͷΑ͏ͳΛߋ৽ͦ͠ͷ݁Ռ͕Ͳ͏ͳΔͷ͔એ ݴతʹॻ͘͜ͱ͕Ͱ͖Δ
Redux is Կʁ ɾpropsόέπϦϨʔͷճආ ɾClassComponent -> ؔComponetͷҠߦ͍͢͠ ɾRedux Devtool ɺRedux-SagaͳͲपลϥΠϒϥϦΛؚΊΤίγεςϜ͕
Ͱ͖͍ͯΔ → React Redux మ൘
Redux࠷ߴ͡ΌΜ ͍ReduxͰ͍͍͡ΌΜ
ͳͥ Redux ΛΘͳ͍͔ʁ Redux ͷσϝϦοτ ɾهࡌ͕ ɾॳظڭҭίετߴΊ
ͳͥ Redux ΛΘͳ͍͔ʁ • ΞϓϦͷಛੑʹΑͬͯRedux͗͢Δ͜ͱ͕͋Δ • HooksͰؔComponentͰStateΛ͑ΔΑ͏ʹͳͬͨ • ContextΛͬͯɺωετͨ͠ίϯϙʔωϯτͰGlobalͳ ʹΞΫηεͰ͖Δ
• useReducerͱ͍͏Hooks͋Γಉ͡Α͏ͳ࣮Ͱ͖ͦ͏ • Hooks͕ग़ΔલrecomposeΛͬͯߴ֊ؔΛͬͯͨ → ͦ͜·ͰෳࡶͰͳ͍ΞϓϦͰɺReduxͳ͠Ͱӡ༻Ͱ͖Δ ͷͰʁ
ContextͱHooksΛͬͨStateཧ
ContextͱHooksΛͬͨStateཧ Context is Կʁ • ίϯϙʔωϯτπϦʔʹରͯ͠άϩʔόϧͱΈͳͤΔ • ҙͷΛValueͱͯ͠อ࣋Մೳ • https://ja.reactjs.org/docs/context.html
• APIs • React.createContext • Context.Provider
ContextͱHooksΛͬͨStateཧ Context is Կʁ
ContextͱHooksΛͬͨStateཧ Hooks is Կʁ • React 16.8 ͰՃ͞Εͨ৽ػೳ • useXXX
ͱ͍͏ͷ͕ಛ • StateͷཧͳͲReactͷػೳΛClassΛΘͣʹॻ͚Δ ɹhttps://ja.reactjs.org/docs/hooks-intro.html • APIs • useState • useContext • useEffect • useReducer
ContextͱHooksΛͬͨStateཧ Hooks - useContext • const {value} = useContext(HogeContext) •
ҾͰ͢Context͔ΒvalueΛऔΓग़ͤΔ
ContextͱHooksΛͬͨStateཧ Hooks - useState • const [value, setValue] = useState(initialValue)
• valueͱͦΕΛมߋՄೳͳؔΛΓʹ࣋ͭ
Context ͱ useStateΛ Έ߹Θͤͯ Stateཧͯ͠ΈΔ
ContextͱHooksΛͬͨStateཧ ContextͰStateͱؔΛཧ • ContextͷValueҙͷΛཧͰ͖Δ • ValueͰstateͱͦΕΛมߋՄೳͳؔΛཧ
ContextͱHooksΛͬͨStateཧ ContextͰStateͱؔΛཧ
͜ΕͰόέπϦϨʔͳ͠Ͱ GlobalStateʹΞΫηεͰ͖Δ
ContextͱHooksΛͬͨStateཧ طଘͷRedux͔Βͷஔ͖͑ʁ • ࠓ·ͰContainerComponentͰ͍ͬͯͨ mapStateToPropsɺmapDispatchToPropsΛuseContext ͔ΒऔΓग़ͨ͠useStateͷΓʹஔ͖͑Δ
ContextͱHooksΛͬͨStateཧ طଘͷRedux͔Βͷஔ͖͑ʁ • ReduxͰcomponentͷpropsʹ͜Μͳײ͡Ͱ߹͍ͯͨ͠
• εοΩϦʂ ContextͱHooksΛͬͨStateཧ طଘͷRedux͔Βͷஔ͖͑ʁ
ContextͱHooksΛͬͨStateཧ StateͷมߋཧΛݫີʹ͍ͨ͠ʁ • useStateͷΘΓʹuseReducerΛ͑Αͦ͞͏
ContextͱHooksΛͬͨStateཧ const [state, dispatch] = useReducer(reducer, initialSate) (state, action) =>
newState ͱ͍͏ܕͷϦσϡʔα (reducer) Λड͚ औΓɺݱࡏͷ state Λ dispatch ϝιουͱϖΞʹͯ͠ฦ͠·͢ɻ Hooks - useReducer
ContextͱHooksΛͬͨStateཧ Providerଆͷ࣮ Hooks - useReducer
ContextͱHooksΛͬͨStateཧ Consumerଆʢར༻ଆͷ࣮ʣ Hooks - useReducer
Reduxͳ͠Ͱঢ়ଶཧͰ͖ͦ͏
ݒ೦
ݒ೦ • ͦͦuseReducerهࡌͷ͞Λղܾ͠ͳ͍ • Redux-thunk, Redux-SagaͷΑ͏ͳඇಉظॲཧΛαϙʔ τ͢ΔϥΠϒϥϦͱ͔·ͩͳͦ͞͏ • ReduxDevTool͑ͳ͍ •
Contextຊདྷstyle themeͳͲཧ͢Δͷ • ConsumerΛར༻͢ΔίϯϙʔωϯτProviderͷมߋ Λड͚Δͱ࠶ඳը͞ΕΔͷͰɺύϑΥʔϚϯεʹӨڹ͕ ͋Δ
݁ • هࡌͷੑΛճආ͢Δ͜ͱͰ͖Δ • ReduxͷΤίγεςϜʹ͍Εͳ͍ͷͭΒ͍ • ΞϓϦέʔγϣϯͷαΠζײෳࡶ͞ʹΑͬͯ͋Γ ͔
ࢀߟϥΠϒϥϦ ContextΛ͏ϥΠϒϥϦ1 react-redux • Consumerͷه๏ Hooks͕ೖΔલͷॻ͖ํ • const { store
: { dispatch } } = useContext(ReactReduxContext)
ࢀߟϥΠϒϥϦ ContextΛ͏ϥΠϒϥϦ2 React Tracked • Super fast React global/shared state
with context and hooks • Pure ReactͩͱύϑΥʔϚϯε͕͋ΔͷͰͦΕΛղܾ͠ɺ͞Βʹ؆ܿʹॻ͚Δ
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠