ドメイン駆動設計勉強会〜値オブジェクト編〜 / 2024-02-06

by Takuma Yamamoto

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υϝΠϯۦಈઃܭ ษڧձ Takuma Yamamoto ʙ ஋ΦϒδΣΫτฤ ʙ

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BIOGRAPHY ͋ͳͨ͸୭Ͱ͔͢ʁ 5BLVNB:BNBNPUP 8PSLBUTOBQNF 'SPN.JZB[BLJ 4/4 झຯ ɾɹɹIUUQTHJUIVCDPNUBNBHPLFSBO ɾɹɹIUUQTUXJUUFSDPNZBNBUBLV ɾɹɹIUUQTRJJUBDPNUBNBHPLFSBO ɾɹɹIUUQT[FOOEFWUBNBHPLFSBO ɾ͓΍ͭ ɾα΢φ ɾΞχϝ ɾɹɹIUUQTOPUFDPNUBNBHPLFSBO ࠷ۙ΍͍ͬͯΔ͜ͱ ɾΤϯδχΞ࠾༻શൠ ɾ-BNCEBΛ࢖ͬͨ$3.ͷ࣮૷

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INTRODUCTION ۦ͚ग़͠ͷࠒʹಡΜͰ࠳ં… ΤϯδχΞʹͳΓͨͯͷࠒɺ࣮ફυϝΠϯۦಈઃܭͱ͍͏ຊΛಡ΋͏ͱͯ͠࠳ં͠·ͨ͠ɻ   લఏ஌͕ࣝ଍Γͣɺ஌Βͳ͍༻ޠͩΒ͚ͰɺಡΈਐΊΔ͜ͱ͕Ͱ͖·ͤΜͰͨ͠ɻ

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INTRODUCTION εφοΫϛʔͰ΋ DDD Λϕʔεʹ։ൃ͍ͯ͠Δ ࠾༻ͰεφοΫϛʔͷྺ࢙Λ஌Γɺ։ൃʹ͓͚Δ൓লͷ΋ͱɺ%%%Λಋೖͨ͜͠ͱΛ஌Γ·ͨ͠ɻ   ࣗ෼΋ΩϟονΞοϓͯ͠ɺ͔ͬ͠Γઃܭʹଇͬͯ։ൃͰ͖ΔΑ͏ʹͳΖ͏ͱܾ৺͠·ͨ͠ɻ ࢀߟIUUQTMBCTTOBRNFFOUSZ

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INTRODUCTION ΤϯδχΞʹ༏͍͠ೖ໳ॻΛݟ͚ͭͨʂ ࠓ౓͸࠳ંͨ͘͠ͳ͍ͳʔͱࢥ͍ͬͯͨͱ͜Ζɺ͋Γ͕͍ͨ͜ͱʹ։ൃऀʹͱͬͯ༏͍͠ೖ໳ॻ͕ൃച ͞Ε͍ͯͨͷͰɺʮυϝΠϯۦಈઃܭೖ໳ʯͱ͍͏ຊΛखʹऔΓ·ͨ͠ɻ

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What is DDD? ͦ΋ͦ΋ Domain Driven Design ͱ͸ԿͰ͔͢ʁ

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INTRODUCTION υϝΠϯͷ஌ࣝʹয఺Λ౰ͯͨ ઃܭख๏ lυϝΠϯz ϓϩάϥϜΛద༻͢Δର৅ͱͳΔྖҬ l஌ࣝʹয఺Λ౰ͯΔz ར༻ऀͷߟ͑΍ࢹ఺ɺऔΓר͘Λ؀ڥΛཧղ͢Δ͜ͱ ϓϩάϥϜΛద༻͢Δର৅ͱͳΔྖҬΛ࣮ࡍʹ ར༻͍ͯ͠Δਓͨͪͷߟ͑ํ΍ࢹ఺ɺ൴ΒΛऔ Γר͘؀ڥΛཧղ͢Δ͜ͱΛॏࢹͨ͠ઃܭख๏

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INTRODUCTION υϝΠϯʹৄ͍͠ਓͱͷର࿩͕େࣄ υϝΠϯΤΩεύʔτͱίϛϡχέʔγϣϯΛͱΓͳ͕ΒɺυϝΠϯʹର͢ΔཧղΛਂΊͨΓɺ৘ใΛ ੔ཧͨ͠Γͯ͠ઃܭ͢Δ͜ͱ͕ଟ͍Ͱ͢ɻ ΤϯδχΞͱؔ܎ऀ͕ɺೝࣝͷͣΕ͕ͳ͘ڞ௨ͷݴ༿Ͱ࿩ͤΔΑ͏ʹɺνʔϜಠࣗͰ࡞Γ্͛ΔϢϏΩ λεݴޠͱ͔͕ॏཁʹ΋ͳͬͯ͘ΔΑ͏Ͱ͢Ͷɻ υϝΠϯͷ֓೦ υϝΠϯϞσϧ υϝΠϯ   ΦϒδΣΫτ ͜͜ͷ࿩ ҰํͰ͜͜͸࣮ફϕʔεͰܦݧΛੵΜͰ͍͘෦෼ͳͷͰɺ͙͙͢͢਎ʹ͚ͭΔͷ͸೉͍͠ɻɻɻ

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How do we learn about DDD? ͜ͷษڧձͰ͸ɺͲͷΑ͏ʹ DDD ΛֶΜͰ͍͔͘ʁ

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POLICY DDD ʹऔΓ૊ΉͨΊͷಓ͠Δ΂Λݟ͚ͭΔ %%%Ͱग़ͯ͘Δ༻ޠ͸େ͖͘෼͚ͯɺ֓೦Λநग़͢ΔϞσϦϯάͱl֓೦Λ࣮૷ʹམͱ͠ࠐΉͨΊͷ ύλʔϯͷछྨʹ෼͚ΒΕ·͢ɻ ޙऀ͸ΑΓৄࡉͳαϯϓϧίʔυͳͲʹ΋མͱ͠ࠐΊΔͷͰɺΤϯδχΞʹͱͬͯཧղ͠΍͍͢ͱ͍͏ ੑ࣭͕͋Γ·͢ɻͦ͜Ͱ͜ͷษڧձͰ͸ɺޙऀͷཧղΛਐΊΔ͜ͱʹूத͠ɺલऀʹऔΓ૊Ήͱ͖ͷಓ ͠Δ΂Λݟ͚ͭ·͢ɻ υϝΠϯͷ֓೦ υϝΠϯϞσϧ υϝΠϯ   ΦϒδΣΫτ ͜͜ʹूத

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Why will we be learning about Value Objects? ͳͥ஋ΦϒδΣΫτʹֶ͍ͭͯͿͷ͔ʁ

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LESSON ϓϦϛςΟϒͳ஋͚ͩͰγεςϜΛߏங͢Δͷ͸೉͍͠ ࢯ໊ΛऔΓѻ͏γεςϜ͕͋ͬͨͱͯ͠ɺ੏͚ͩΛද͍ࣔͨ͠ͱ͖͕͋Δͱ͠·͢ɻ   จࣈྻܕͷ஋Λ֨ೲ͢Δม਺GVMM@OBNF͚ͩͰ͸ɺ໊͕දࣔ͞Εͯ͠·͏͜ͱ͕͋Γ·͢ɻ ੒ޭύλʔϯҙਤ௨Γl੏z͕දࣔ͞ΕΔ ࣦഊύλʔϯҙਤʹ൓ͯ͠l໊z͕දࣔ͞ΕΔʢGVMM@OBNFʹ੏໊ͷॱͰೖྗ͞ΕΔͨΊʣ

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LESSON ΦϒδΣΫτΛར༻͢Δͱ؅ཧ͠΍͘͢ͳΔ͜ͱ΋͋Δ ΦϒδΣΫτࢦ޲ϓϩάϥϛϯάͰ͸ҰൠʹΫϥεͰ࣮૷͞ΕΔ͜ͱ͕ଟ͍Ͱ͢ΑͶɻ   ͜͜Ͱ΋ΫϥεΛ࢖࣮ͬͯ૷͢Δͱ؅ཧ͠΍͘͢ͳΓ·͢ɻ lୈҾ਺ʹ໊ɺୈҾ਺ʹ੏zͱ͍͏ϧʔϧ͕कΒΕΔݶΓඞͣl੏z͕දࣔ͞ΕΔ ͜ͷΑ͏ʹɺγεςϜʹͱͬͯ࠷దͳl஋ͷѻ͍ํz͕ϓϦϛςΟϒͳ஋Ͱ͋Δͱ͸ݶΓ·ͤΜɻ   ্ه͸ΦϒδΣΫτͰ΋͋Γɺ஋Ͱ΋͋ΔɻΏ͑ʹl஋ΦϒδΣΫτzͱॻ͔Ε͍ͯ·͢ɻ

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What are the properties of “Value”? ͦ΋ͦ΋ “஋” ͕࣋ͭੑ࣭ͱ͸Կ͔

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LESSON ͦ΋ͦ΋ “஋” ͱ͸Ͳ͏͍ͬͨੑ࣭Λ࣋ͭͷ͔ lΦϒδΣΫτͰ΋͋Γɺ஋Ͱ΋͋Δzͱฉ͍ͯ΋ύοͱ͠ͳ͍͔΋͠Ε·ͤΜɻͦ΋ͦ΋l஋zͱ͸ Ͳ͏͍͏ੑ࣭Λ͍࣋ͬͯΔͷͰ͠ΐ͏͔ʁ͜ͷຊͰ͸ҎԼͷΑ͏ͳੑ࣭͕͋Δͱ঺հ͞Ε͍ͯ·͢ɻ ͔͜͜Β͸্هͷੑ࣭ʹ͍ͭͯɺͻͱͭͣͭ۷ΓԼ͛ͯɺ஋ͱ͸Կ͔ʹֶ͍ͭͯΜͰ͍͖·͢ɻ ɾෆมͰ͋Δ   ɾަ׵͕ՄೳͰ͋Δ   ɾ౳ՁੑʹΑͬͯൺֱ͞ΕΔ

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How are the properties represented in Value Objects? ͦͷੑ࣭Λ஋ΦϒδΣΫτͰͲ͏දݱ͢Δ͔

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LESSON ஋ͷੑ࣭ “ෆมͰ͋Δ” ஋ͷมߋΛߦ͏ͱ͖୅ೖΛར༻͠·͕͢ɺม਺ͷ஋ͦͷ΋ͷΛมߋ͍ͯ͠ΔΘ͚Ͱ͸͋Γ·ͤΜɻ   ม਺ͷ಺༰ΛೖΕସ͍͑ͯ·͢ɻ ஋͸ෆม͔ͩΒͦ͜ɺ։ൃऀ͸҆શʹγεςϜΛߏங͢Δ͜ͱ͕Ͱ͖Δͱ͍͏͜ͱͰ͢ɻ ΋͠஋ͦͷ΋ͷΛมߋͰ͖ͯ͠·͏ͱɺҎԼͷΑ͏ͳ͜ͱ͕ى͖ͯࠞཚΛੜΈग़ͯ͠͠·͍·͢ɻ

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LESSON ஋ΦϒδΣΫτͱͯ͠ਖ਼͍࣮͠૷͸ʁ ͜Ε·Ͱ։ൃΛ͖ͯͯ͠ɺҎԼͷΑ͏ͳίʔυΛ໨ʹͨ͜͠ͱ͕͋Δͱࢥ͍·͢ɻ   ஋ͷlෆมͰ͋Δzͱ͍͏ੑ্࣭ɺҎԼͷ࣮૷͸஋ΦϒδΣΫτͱͯ͠ਖ਼͍͠Ͱ͠ΐ͏͔ʁ

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LESSON “ෆมͰ͋Δ” ͱ͍͏ੑ࣭ʹഎ࣮͘૷ ஋͸lෆมͰ͋Δzͱ͍͏ੑ࣭࣋ͪ·͢ɻ   ͦͷͨΊΦϒδΣΫτʹର͠มߋΛՃ͑ΒΕΔ࣮૷͸ɺ஋ΦϒδΣΫτͱͯ͠ਖ਼͋͘͠Γ·ͤΜɻ

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LESSON ஋ͷੑ࣭ “ަ׵͕ՄೳͰ͋Δ” ઌड़ͨ͠௨Γɺม਺ͷ஋Λมߋ͢Δʹ͸ɺ୅ೖΛར༻ͨ͠l஋ͷަ׵zͱ͍͏खஈΛબ୒͠·͢ɻ Ͱ͸ɺҎԼͷΑ͏ͳ࣮૷͕ෆద੾ͩͱͨ͠ΒɺมߋΛߦ͏ͱ͖Ͳ͏͢Ε͹ྑ͍Ͱ͠ΐ͏͔ʁ

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LESSON ΦϒδΣΫτΛؙ͝ͱަ׵͢Δͷ͕ਖ਼͍࣮͠૷ ஋͸lෆมͰ͋Γzɺzަ׵͕ՄೳͰ͋Δzͱ͍͏ੑ࣭Λߟ͑ΔͱɺҎԼͷ࣮૷͕ਖ਼͘͠ͳΓ·͢ɻ   ΦϒδΣΫτΛมߋ͢ΔͷͰ͸ͳ͘ɺ࠶౓ΦϒδΣΫτΛੜ੒ͯ͠ɺ୅ೖ͠·͠ΐ͏ɻ

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LESSON ஋ͷੑ࣭ ”౳ՁੑʹΑͬͯൺֱ͞ΕΔ” ஋͸ҎԼͷίʔυͰࣔ͢Α͏ʹɺಉҰੑͰ͸ͳ͘ɺ౳ՁੑʹΑͬͯൺֱ͞Ε·͢ɻ

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LESSON ஋ΦϒδΣΫτͱͯ͠ਖ਼͍࣮͠૷͸ʁ ΦϒδΣΫτಉ࢜ͷൺֱͱͳΔͱɺଐੑΛऔΓग़ͯ͠ൺֱ͢Δํ๏͕ࢥ͍ු͔Ϳ͔΋͠Ε·ͤΜɻ   Ͱ΋஋Ͱ͋Δͱͨ͠Βɺ͍͔͞͞ෆࣗવͳ࣮૷ʹͳͬͯ͠·͍·͢ɻ ଐੑΛશͯऔΓग़ͯ͠ൺֱ͢Δ࣮૷ ͜ΕΛ਺஋ͷൺֱʹஔ͖׵͑ΔͱෆࣗવͰ͢ΑͶ

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LESSON ஋ΦϒδΣΫτʹ౳ՁൺֱͷϝιουΛ࣮૷͢Δ ΦϒδΣΫτಉ͕࢜࣋ͭશͯͷଐੑΛൺֱ͢ΔϝιουΛ࡞੒͠ɺͦΕΛൺֱ࣌ʹ࢖༻͠·͢ɻ ΦϒδΣΫτಉ࢜Λൺֱ͢ΔϝιουΛ௥Ճ ͜ͷΑ͏ʹൺֱ͢Ε͹ɺ͔͋ͨ΋஋Λൺֱ͍ͯ͠Δͷͱಉ͡Α͏ʹ࣮૷Ͱ͖·͢

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The bene fi ts of using Value Objects ஋ΦϒδΣΫτΛ࢖༻͢ΔϝϦοτͱ͸

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LESSON ஋ΦϒδΣΫτΛ࢖༻͢ΔϝϦοτʹ͍ͭͯ ͜Ε·ͰεϥΠυΛಡΜͰ͖ͯɺ͢Ͱʹؾ͍͍ͮͯΔਓ΋͍Δ͔ͱࢥ͍·͢ɻ͜͜ͰվΊͯຊͷதͰ ΋঺հ͞Ε͍ͯΔϝϦοτʹ͍ͭͯڞ༗͠·͢ɻ ͔͜͜Β͸্هͷϝϦοτʹ͍ͭͯ঺հ͠·͢ɻద੾ͳ৔໘ʹग़͘Θͨ͠ͱ͖ɺ஋ΦϒδΣΫτͰ ࢖࣮ͬͯ૷͍ͨ͠ͱࢥͬͯ΋Β͑Δͱخ͍͠Ͱ͢ɻ ɾදݱྗΛ૿͢   ɾෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍   ɾޡͬͨ୅ೖΛ๷͙   ɾϩδοΫͷࢄࡏΛ๷͙

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LESSON ϝϦοτ “දݱྗΛ૿͢” ࡏݿ؅ཧʹ͓͍ͯɺ঎඼ίʔυΛҎԼͷΑ͏ʹϓϦϛςΟϒͳ஋Ͱ؅ཧ͍ͯ͠Δͱ͠·͢ɻ͔͠͠ɺ ͜Ε͚ͩͩͱ঎඼ίʔυ͕ͲͷΑ͏ͳϩδοΫͰઃܭ͞Ε͍ͯΔ͔ಡΈऔΕ·ͤΜɻ ҰํͰҎԼͷΑ͏ʹ஋ΦϒδΣΫτͰ࣮૷͢Δͱɺ࣮͸ʮΧςΰϦɾ࿈൪ɾϨϏδϣϯʯͱ͍͏ߏ੒ Ͱ঎඼ίʔυ͕ઃܭ͞Ε͍ͯΔ͜ͱ͕໌֬ʹͳΓ·͢ɻ

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LESSON ϝϦοτ “ϩδοΫͷࢄࡏΛ๷͙” ঎඼ίʔυʹ͓͚ΔlΧςΰϦʔͷ෦෼͕จࣈͰߏ੒z͞ΕΔ࢓༷ͩͱ͠·͢ɻͦͷ࢓༷ΛνΣοΫ ͢ΔॲཧΛ஋ΦϒδΣΫτΛ࢖༻ͤͣɺҎԼͷΑ͏ʹ࣮૷͍ͯͨ͠ͱ͠·͢ɻ γεςϜΛ։ൃ্͍ͯ͘͠Ͱɺ঎඼ίʔυ͕ೖྗ͞ΕΔՕॴ͕૿͑ΔͱɺͦΕʹ൐্͍هͷॲཧ΋૿ ͑·͢ɻͦͷঢ়گͰΧςΰϦʔͷจࣈ਺ΛzจࣈzͰߏ੒͢ΔΑ͏มߋͨ͠ΒͲ͏ͳΔͰ͠ΐ͏ʁ ։ൃ͢Δͷ͸ࢲͨͪਓؒͰ͢ɻਓؒͳͷͰϛε΋͠·͢ɻରԠ࿙Ε΋͖ͬͱൃੜͯ͠͠·͍·͢ɻ

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LESSON ϝϦοτ “ϩδοΫͷࢄࡏΛ๷͙” ͦͷॲཧΛl஋ΦϒδΣΫτzͱͯ͠Ϋϥεͷதʹด͡ࠐΊɺඞͣl஋ΦϒδΣΫτzΛ௨ͯ͠ॲཧ͠ ͯ͠·͑͹ɺ࢓༷มߋ͕͋ͬͨͱͯ͠΋ɺͦͷՕॴͷΈͷमਖ਼͢Ε͹࿙Εͳ͘ରԠ͕Ͱ͖·͢ɻ

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LESSON ϝϦοτ “ෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍” ઌड़ͨ͠௨Γl஋ΦϒδΣΫτzΛ࢖༻ͤͣʹ࣮૷ͨ͠৔߹ɺॲཧ͕ࢄࡏ͠ɺରԠ࿙Ε͕ൃੜ͢ΔϦ εΫ΋ߴ·Γ·͢ɻ΋ͦ͠ͷϦεΫ͕࣮ݱͯ͠͠·͏ͱԿ͕ى͜ΔͰ͠ΐ͏͔ʁ ઌ΄ͲͷΑ͏ʹɺΧςΰϦʔͷจࣈ਺Λzจࣈzͱ͢Δ࢓༷ʹม͑ͨ͸ͣͳͷʹɺલͷ࢓༷ͷ··Χ ςΰϦʔ෦෼͕จࣈͷ঎඼ίʔυσʔλ͕ੜ੒͞Εͯ͠·͍·͢ɻ

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LESSON ϝϦοτ “ෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍” ෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍ͨΊʹ΋ɺz஋ΦϒδΣΫτzΛ࢖༻ͯ͠ϩδοΫΛҰݩ؅ཧ͢Δ͜ͱͰɺର Ԡ࿙ΕΛ๷͙͜ͱ͕ॏཁʹͳΓͦ͏Ͱ͢Ͷɻ

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LESSON ϝϦοτ “ޡͬͨ୅ೖΛ๷͙” ҎԼͷΑ͏ʹ঎඼Λදݱ͢ΔΫϥε͕͋Γɺz঎඼ίʔυzΛจࣈྻͰѻ͍ͬͯΔͱ͠·͢ɻ ͜ͷ࣮૷Ͱ͸ɺޡͬͯl঎඼໊zΛೖྗͯ͠͠·ͬͨͱͯ͠΋ɺॲཧ͕௨ͬͯ͠·͍·͢ɻ

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LESSON ϝϦοτ “ޡͬͨ୅ೖΛ๷͙” ͜͏͍ͬͨ͜ͱΛ๷͙ͨΊʹɺઌ΄Ͳ࡞ͬͨ1SPEVDU$PEFΫϥεͷΠϯελϯε͚ͩΛڐ༰͢ΔΑ ͏ʹ͢Ε͹ɺͦ΋ͦ΋1SPEVDU$PEFͰϛεʹؾͮ͘͜ͱ͕Ͱ͖ΔͷͰɺޡͬͨ୅ೖΛ๷͛·͢ɻ

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How do we set the criteria? ஋ΦϒδΣΫτͱ࣮ͯ͠૷͢΂͖ج४͸ʁ

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LESSON ਖ਼ղ͸ͳ͍ɺίϯςΩετʹ߹ͬͨج४ΛఆΊΔ ஋ΦϒδΣΫτͰ࣮૷͢Δ΂͖͔Ͳ͏͔ɺͦΕ͸γεςϜ΍αʔϏεͷίϯςΩετʹΑͬͯมΘΔ ͨΊɺҰ֓ʹܾΊΒΕΔ΋ͷͰ͸͋Γ·ͤΜɻͱ͸͍͑ɺԿ͔͠Βͷج४͕ཉ͘͠ͳΓ·͢ΑͶɻ ͜ͷຊͷචऀ͸ɺج४ͷҰྫͱͯ͠ɺҎԼͷΑ͏ͳ͜ͱΛ঺հ͍ͯ͠·͢ɻ ʮͦ͜ʹϧʔϧ͕ଘࡏ͍ͯ͠Δ͔ʯ ʮͦΕ୯ମͰऔΓѻ͍͍͔ͨʯ

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Where could we potentially use Value Objects? εφοΫϛʔͩͱɺͲ͜Λ஋ΦϒδΣΫτͰ࣮૷Ͱ͖ͦ͏͔ʁ

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GitHub Ͱ୳ͯ͠Έ·͠ΐ͏ʂ

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Summary ஋ΦϒδΣΫτʹ͍ͭͯ·ͱΊΔͱ…

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SUMMARY ஋ΦϒδΣΫτʹֶ͍ͭͯΜͰΈͯ… ɾ஋ΦϒδΣΫτ͸ɺҎԼʹࣔ͢Α͏ͳz஋zͷੑ࣭Λ࣋ͭ   ɹɾෆมͰ͋Δɺަ׵͕ՄೳͰ͋Δɺ౳ՁੑʹΑͬͯൺֱ͞ΕΔ   ɾ஋ΦϒδΣΫτΛ࢖ͬͨγεςϜ։ൃ͸ɺҎԼʹࣔ͢Α͏ͳϝϦοτΛ࣋ͭ   ɹɾදݱྗΛ૿͢ɺෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍ɺޡͬͨ୅ೖΛ๷͙ɺϩδοΫͷࢄࡏΛ๷͙   ɾ஋ΦϒδΣΫτͰ࣮૷͢Δ͔Ͳ͏͔ͷج४ʹਖ਼ղ͸ͳ͍   ɹɾίϯςΩετΛ౿·͑ͯɺνʔϜͰٞ࿦ͯ͠ఆΊΔͱΑͦ͞͏

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Recruitment ΤϯδχΞืूதͰ͢ʂ

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RECRUITMENT We are Hiring! εφοΫϛʔͰ͸ɺʮ͓΍ͭͱɺੈքΛ໘ന ͘ʯ͍ͯ͘͠ɺͦΜͳ׆ಈΛ࢓ࣄͱͯ͠औΓ૊ Έ͍ͨΤϯδχΞΛืू͍ͯ͠·͢ɻ IUUQTUFBNTOBRNFDPN εφοΫϛʔ࠾༻