オブジェクト指向設計実践ガイドこれだけは実践しとこうガイド

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ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυ by @taiki_ _t   ԙ: Rails Developers Meetup 2018-7-14

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ͰɺͩΕʁ

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ଞ໊

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༁ऀͰ͢ 5XJUUFS!UBJLJ@@U Α͔ͬͨΒ  ώϣϩʔ͓ͳ͠Ό͢ʂ ੢೔฻ཬSC   (SBQI2-5PLZP  ओ࠵

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࠷ۙͷ׆ಈ ΞϓϦ࡞ͬͯ·͢ 3FBDU/BUJWF  3BJMT  (SBQI2-

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ϩʔΧϧ൪૊ɾ$.ͷΑ͏ͳ ৘ใڞ༗खஈΛશһͷखʹɻ ୭΋͕ۙ͘ͷਓʹ৘ใΛ఻͑ΒΕΔɺ୭΋͕ۙ͘ͷ৘ใΛಘΒΕΔɻ ͜Ε·Ͱࢿຊ͕ͳ͚Ε͹Ͱ͖ͳ͔ͬͨ৘ใ֦ࢄखஈΛશһͷखʹղ์ɻ $PODFQU ΞϓϦ঺հ

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ौ୩۠ஸ໨LNݍ಺ ✅౤ߘʹ͸Ґஔ৘ใ͕ࣗಈͰͭ͘ ✅Ӿཡ͢Δਓ͸ډ৔ॴºൣғͰ౤ߘΛߜΕΔ ౤ߘ͢Δ͚ͩͰۙ͘ͷਓʹڭ͑ΒΕΔ  ։͚ͩ͘Ͱͦͷ৔ͷ৘ใ͕ΈΕΔ 1SPEVDU ✅ࣸਅΛࡱͬͯ౤ߘ ΞϓϦ঺հ

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·͋৭ʑ ೉͍͠

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ײ૝ͩ͋͘͠ʢJ04ʣ

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࣮ફͱ͸

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࠷খݶͷίετͰ ࠷େݶมߋʹڧ͍ίʔυΛॻ͘ ݶΒΕͨ࣌ؒͱ  Ϧιʔεͷத લఏ ໨ඪ

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lࠓ೔ʹͰ΋ձ͕ࣾ౗࢈ͯ͠͠·͏ͱ͍͏ঢ়گͰ͋Ε ͹ɺཌ೔ʹɺͦͷίʔυʹͲΕ͚ͩͷίετ͕͔͔ Δ͔Λؾʹ͍ͯ͠Δ৔߹Ͱ͸͋Γ·ͤΜɻ༩͑ΒΕ ͨ࣌ؒͰ࠷ળΛਚ͔͘͢͠ͳ͍ͷͰ͢ɻz ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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lઃܭʹ൒݄͔͔ΓɺརӹΛੜΈग़͢Α͏ʹͳΔ·Ͱ ʹ೥͔͔ΔΑ͏Ͱ͋Ε͹ɺ͓ͦΒͦ͘ͷઃܭʹ͸ݟ ߹͏΄ͲͷՁ஋͸͋Γ·ͤΜɻz ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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ݱ࣮

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✔ݶΒΕͨ࣌ؒ ✔ݶΒΕͨϦιʔε ✔มԽ͢Δཁٻ ✔༧ଌͰ͖ͳ͍ະདྷ

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ͷதͰ

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lݱ࣌఺ɺͦͯ͠ະདྷʹ͓͍ͯ΋ɺҰ؏ͯ͠අ༻ରޮՌ ͷ༏Εͨߏ੒Λߟ͑Δඞཁ͕͋Γ·͢ɻz ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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ੜ͖ൈ͘ʜ

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ઃܭ

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l࣮༻తͳઃܭͱ͸ɺະདྷΛਪଌ͢Δ΋ͷͰ͸ͳ͘ɺ ະདྷΛड͚ೖΕΔͨΊͷબ୒ࢶΛอޢ͢Δ΋ͷͳͷ Ͱ͢ɻz ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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࠷খݶͷ ίετͰ ࠷େݶม ߋʹڧ͍

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ͦ͜Ͱ

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536&ݪଇ ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυᶃ

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ݟ௨͕͠ྑ͍ʢ5SBOTQBSFOUʣɿ มߋ͢Δίʔυʹ͓͍ͯ΋ɺͦͷίʔυʹґଘ͢Δ ผͷ৔ॴͷίʔυʹ͓͍ͯ΋ɺมߋ͕΋ͨΒ͢Өڹ ͕໌നͰ͋Δ ར༻ੑ͕ߴ͍ʢ6TBCMFʣɿ ͲΜͳมߋͰ͋ͬͯ΋ɺ͔͔Δίετ͸มߋ͕΋ͨ Β͢རӹʹ;͞Θ͍͠ ߹ཧతʢ3FBTPOBCMFʣɿ ৽͍͠؀ڥɺ༧ظ͍ͯ͠ͳ͔ͬͨ؀ڥͰ΋࠶ར༻Ͱ ͖Δ ໛ൣతʢ&YFNQMBSZʣɿ ίʔυʹมߋΛՃ͑Δਓ͕ɺ্هͷ඼࣭Λࣗવͱอ ͭΑ͏ͳίʔυʹͳ͍ͬͯΔ ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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ݟ௨͕͠ྑ͘ɺ߹ཧతͰɺར༻ੑ͕ߴ͘ɺ໛ൣత ʢͦΕͧΕͷӳ୯ޠͷ಄จࣈΛͱͬͯ536&ʣͳίʔ υ͸͍·ݱࡏͷχʔζΛຬ͚ͨͩ͢Ͱ͸ͳ͘ɺকདྷ తͳχʔζΛຬͨ͢Α͏ʹมߋΛՃ͑Δ͜ͱ΋Ͱ͖ ·͢ɻ ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج 536&ͳίʔυΛॻͨ͘Ίͷ࠷ॳͷҰา ͸ɺͦΕͧΕͷΫϥε͕ɺ໌֬ʹఆٛ͞ Εͨ୯Ұͷ੹೚Λ࣋ͭΑ͏పఈ͢Δ͜ͱ Ͱ͢ɻ

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୯Ұ੹೚ ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυᶄ 536&ͳίʔυͷͨΊʹ

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Ϋϥε΋

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ϝιου΋

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୯Ұ੹೚Λ ৺͕͚Α͏

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Ͱ΋Ͱ͖ͳ͍ͱ͖͋Δ ΑͶ

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ίϝϯτ ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυᶅ

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536&ݪଇ͔Β  ཭ΕΔ࣌͸  ίϝϯτͰิ͏

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ݟ௨͕͠ྑ͘ͳ͍ʢ҉໧ͷ஌͕ࣝ͋Δʣͱ͖ ͦΕΛॻ͘ ֎෦ίϯϙʔωϯτͷಈ͖ͱ͔ https://github.com/facebook/react-native/blob/ e9e20e6c8335f27af8469cd23cb7ba079b0422f9/local-cli/generator/templates.js#L49

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߹ཧత͡Όͳ͍ͱ͖ ྫӡ༻ͨ͠Βരൃ͢Δ͡Ό ΜɺΈ͍ͨͳίʔυͳͲ ྫԠٸॲஔ

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ར༻ੑ͕௿͍ͱ͖ ࠶ར༻ੑ͕௿ͯ͘ྑ͍ཧ༝Λॻ͘ɻ ྫݕূ͕ऴΘͬͨΒ͙͢ফ͢ίʔυ

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໛ൣత͡Όͳ͍ͱ͖ɿ ਅࣅ͠ͳ͍ͰͶɺͱཧ૝͸Ͳ͏͔Λ ॻ͘ɻ ༁͜͜ʹ͜ͷίʔυ͕͋Δͷ͸͋ΔछͷϋοΫɻ50%0ΠϯλʔϑΣʔεʹ ௚઀௥Ճ͢Δ IUUQTHJUIVCDPNGBDFCPPLSFBDUOBUJWFCMPCFGCGFBCGDEEDCD 3FBDU"OESPJETSDNBJOKBWBDPNGBDFCPPLSFBDUCSJEHFCSJEHFQSP

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ৗʹ536& Λҙࣝ͢Δ

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૯ྗઓͰ  มߋʹڧ͍ίʔυ Λ࡞͍ͬͯ͜͏

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536&ݪଇ ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυ·ͱΊ ୯Ұ੹೚ ৗʹҙࣝ ৺͕͚ Ͱ͖ͳ͍ͱ͖͸

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൪֎ฤ ΄͔ͷ෢ث

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ίϐϖ ίϐϖ͸࣌ʹڧྗͳ෢ثͩ

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ίϐϖͰ͖ͳ͍΄Ͳ  ௕͍ίʔυ ෳࡶͳίʔυ͸ॻ͔ͳ͍ ίϝϯτ͸ઈର͠Α͏ ͍͍ͤͥճ໨͙Β͍·Ͱɻճ໨ Ҏ߱͸ந৅Խ΍੾Γ෼͚Λ͠Α͏

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༧ݴ͠ͳ͍

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lϓϩάϥϚʔ͸௒ೳྗऀͰ͸ͳ͍ͷͰɺಛఆͷະདྷ Λ༧ଌͨ͠ઃܭ͸ɺ͍͍ࣦͨͯഊʹऴΘΓ·͢ɻz ൈਮ  ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυʙ3VCZͰΘ͔ΔਐԽ͚ͭͮ͠ΔॊೈͳΞϓϦέʔγϣϯͷҭͯํ  4BOEJ.FU[ɺ∁ࢁହج

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ྫɿந৅Խͯ͠  ϙϦϞʔϑΟοΫؔ࿈  ࡞ͬͨΓͯ͠΋ ࢖Θͳ͔ͬͨɾ ࢖͑ͳ͍͜ͱ͕Θ͔ͬͨΒ ࢮ

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EVQMJDBUJPOJTGBSDIFBQFS UIBOUIFXSPOHBCTUSBDUJPO IUUQTXXXTBOEJNFU[DPNCMPHUIFXSPOHBCTUSBDUJPO

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QSFGFSEVQMJDBUJPOPWFSUIF XSPOHBCTUSBDUJPO IUUQTXXXTBOEJNFU[DPNCMPHUIFXSPOHBCTUSBDUJPO

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νʔϜͷ  ߹ҙ

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ίʔυͷ߹ཧੑ͸ ϓϩμΫτͷϑΣʔζ νʔϜʹΑͬͯ΋มΘΔͷͰ Α͘࿩ͦ͏

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ٞ࿦ͷ౔୆  ʢڞ௨ݴޠʣ ͕ཉ͍͠

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ྑ͍ຊ͕͋Δ

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?V?

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͋Ε΋͍ͨ͜͠Ε΋͍ͨ͠  ΋ͬͱ͍ͨ͠΋ͬͱ΋ͬͱ͍ͨ͠  5)&#-6&)&"354ເ

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ݶΒΕͨ࣌ؒͷͳ͔Ͱ  आΓ΋ͷͷ࣌ؒͷͳ͔Ͱ  ຊ෺ͷເΛݟΔΜͩ  5)&#-6&)&"354ເ

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΍͍͖ͬͯ

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ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυ  ͜Ε͚ͩ͸࣮ફ͠ͱ͜͏ΨΠυ by @taiki_ _t   ԙ: Rails Developers Meetup 2018-7-14 5)"/, :06