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Unidirectional Data Flow in ReSwift @_mpon Kyobashi.swift #1

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Masato Oshima github.com/mpon @_mpon ಢ໦ݝ๕լ܊ग़਎ iOS Developer

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DDoommaaiinn DDrriivveenn DDeessiiggnn

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͋Δ೔ͷ4MBDL

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ͱ͍͏͜ͱͰ 3F4XJGU Λௐ΂ͯΈΔ

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Ұఆํ޲ͷΈͷσʔλϑϩʔJO4XJGU 3FEVY͔ΒΠϯεύΠΞ͞Εͨ

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3FEVY

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b`3FEVYJTBOBMUFSOBUJWF PSBWBSJBUJPOPGUIF qVYGSBNFXPSL``

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'MVY

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b`'MVYJTUIFBQQMJDBUJPO BSDIJUFDUVSFUIBU'BDFCPPLVTFT GPSCVJMEJOHDMJFOUTJEFXFC BQQMJDBUJPOT``

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Ұఆํ޲ͷΈͷσʔλϑϩʔ 4UPSF͸ࣗ෼ࣗ਎Λॻ͖׵͑Δ

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+BWB4DSJQUΞϓϦέʔγϣϯͷͨΊͷϑϨʔ ϜϫʔΫɻ'MVYΛਐԽͤͯ͞ෳࡶੑΛճආ͠ Α͏ͱ͍ͯ͠Δɻ

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3FEVYͱಉ͡ߏ੒

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4UPSF͸ΞϓϦέʔγϣϯ ͷ4UBUFΛ؅ཧ͍ͯ͠Δɻ "DUJPO͸4UPSFͷ4UBUFΛ มߋ͢ΔͨΊͷએݴ͕ॻ ͔Ε͍ͯΔɻ 3FEVDFS͸"DUJPOΛड͚ औͬͯ৽͍͠4UBUFΛฦ ͢ɻ

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ϘλϯΛλοϓͨ͠ͱ͖ʹ"DUJPOΛੜ੒ͯ͠ɺ 4UPSFʹEJTQBUDI͢Δɻ

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4UPSF͸ड͚औͬͨ"DUJPOΛ3FEVDFSʹ౉ ͢ɻ

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3FEVDFS͸"DUJPOΛ΋ͱʹ৽͍͠4UBUF Λฦ͢ɻ

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4UPSF͸৽͍͠4UBUFΛ4VCTDSJCF͍ͯ͠Δશ ͯͷ7JFXʹ௨஌͢Δɻ

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7JFX$POUSPMMFS͕TUPSFΛTVCTDSJCF͢Δɻ

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ϘλϯΛԡͨ͠ͱ͖ʹɺ"DUJPOΛੜ੒ͯ͠ɺ 4UPSFʹEJTQBUDI͢Δɻ

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4UPSF͸"QQ%FMFHBUFͰͨͩͭଘࡏͯ͠શͯͷঢ়ଶΛ؅ ཧ͍ͯ͠Δɻͦͯ͠ɺ4UPSF͸3FEVDFSΛ࣋ͪɺ3FEVDFS ͸IBOEMF"DUJPOͱ͍͏ϝιουΛඞͣ࣋ͭɻ IBOEMF"DUJPO͸͖ͬ͞EJTQBUDI͞Εͨ"DUJPOͱݱࡏͷ TUBUFΛ΋ͱʹ৽͍͠"QQ4UBUFΛੜ੒͢Δɻ

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3FEVDFS͸"DUJPOͷछྨʹΑͬͯॲཧΛߦ͍৽͍͠ TUBUFΛੜ੒͢Δɻ΋ͱͷTUBUFΛมߋ͢Δ͜ͱ͸͠ ͳ͍ɻ

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4UPSF͔Β৽͍͠TUBUF͕OPUJGZ͞ΕΔͷͰɺTUBUFΛ ΋ͱʹɺϥϕϧͷදࣔΛߋ৽͢Δɻ

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ΞϓϦ͕େ͖͘ͳ͖ͬͯͨ ͱ͖ʹ4UBUF͕େมͳ͜ͱʹ ͳΓͦ͏ʁ খ͞ͳมߋʹରͯ͠WJFXͷ ࠶ඳըͷύϑΥʔϚϯε͸ Ͳ͏ͳΜͩΖ͏ʁ "OJNBUJPOͷ్தঢ় ଶ΋؅ཧ͢Δͷ͔ʁ

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ReSwift ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ