Annotation? Decorator? - Speaker Deck

Annotation? Decorator?

by fand/amagitakayosi

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"OOPUBUJPOʜ   %FDPSBUPSʜ OHͷ"OOPUBUJPOʹ͍ͭͯ !BNBHJUBLBZPTJ

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@amagitakayosi

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OH ೖ໳

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)5.-ॻ͍ͯ

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+4ॻ͍ͯ

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ΊͰͨ͠ ΊͰͨ͠

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ৄ͘͠͸ޙͰʂ ৄ͘͠͸ޙͰʂ

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ΊͰͨ͠ ΊͰͨ͠

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͍΍͍΍

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OHYYY ϝιουνΣΠϯ

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ΦϨΦϨ$MBTT

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΋ͬͱϞμϯʹ ॻ͖͍ͨʂ

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OH ࠶ೖ໳

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)5.-ॻ͍ͯ

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+4όϕͬͯ +4όϕͬͯ +4όϕͬͯ +4όϕͬͯ +4όϕͬͯ

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&4$MBTTʂ

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ΊͰͨ͠ ΊͰͨ͠

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͍΍͍΍ ͪΐͬͱ଴ͬͯ

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!$PNQPOFOU ͱ͸ʜʜʁ

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%FDPSBUPS

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Decorator w &$."4DSJQU1SPQPTBMͷҰͭ  TUBHF w ؔ਺΍ΫϥεΛम০Ͱ͖Δ w 1ZUIPOͷEFDPSBUPSͱେମಉ͡

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࢖༻ྫ w NJYJO %* ϝϞԽ ʜʜ w KBZQIFMQTDPSFEFDPSBUPS w DIBUXPSLXSBTTF

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https://speakerdeck.com/armorik83/es7-decorators ࢀߟBSNPSJL͞Μͷղઆ

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࣮૷ঢ়گ w CBCFM  CBCFMQMVHJOTZOUBYEFDPSBUPST w 5ZQF4DSJQU  Wd

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CBCFMͰ !$PNQPOFOU ࢖͑Δʂ

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Μʜʜʁ

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SFqFDUNFUBEBUB ແ͠Ͱ !$PNQPOFOU࢖͏ͱ Τϥʔग़Δʂʂʂʂʂ 5ZQF4DSJQUͷ৔߹͸FNJU%FDPSBUPS.FUBEBUBΦϓγϣϯ͕ඞཁ

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reﬂect-metadata w NFUBEBUBΛѻ͏ͨΊͷQPMZpMM w &43FqFDUʹϝιου௥Ճ w 3FqFDUHFU.FUB%BUB ͱ͔

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3FqFDU .FUBEBUB

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ES6 Reﬂect w ϝλϓϩ༻ศརϝιουू w 1SPYZͱ͍ͬ͠ΐʹ࢖ͬͨΓ w AOFXAΛॻ͔ͣʹ  Πϯελϯεੜ੒ͨ͠Γ

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http://www.2ality.com/2014/12/es6-proxies.html ࢀߟ  .FUBQSPHSBNNJOHXJUI &$."4DSJQUQSPYJFT

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NFUBEBUBͬͯ Կʜʜ

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Θ͔Βͳ͍ͷͰ ΤϥʔՕॴ ݟͯΈΔ

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NPEVMFTBOHVMBSTSDDPSFVUJM EFDPSBUPSTUTͰΤϥʔग़ͯΔ

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͙͢ԼͷNBLF%FDPSBUPSͰ 3FqFDU৮ͬͯΔ

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͙͢ԼͷNBLF%FDPSBUPSͰ 3FqFDU৮ͬͯΔ

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"OOPUBUJPO

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Annotation w 5SBDFVS"U4DSJQUͰ࠾༻͞Εͨ  ಛघه๏ͷҰͭ w ؔ਺΍ΫϥεΛؾ߹Ͱम০͢Δ w 1ZUIPOͷEFDPSBUPSͱશવҧ͏

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ର৅ΦϒδΣΫτʹ BOOPUBUJPO഑ྻΛ ڧҾʹੜ΍͠ "OOPUBUJPOΛอଘ

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AtScriptͷग़ྗJSΛݟΔͱ w "OOPUBUJPO͸ؔ਺Ͱͳ͘Ϋϥε w ର৅ͷΫϥεʹ  BOOPUBUJPOϑΟʔϧυΛੜ΍͠  "OOPUBUJPOͷΠϯελϯεΛอଘ

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ڧҾ

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"OOPUBUJPOͰ Ͱ͖Δ͜ͱ͸ %FDPSBUPSͰ΋ Ͱ͖Δʂʂʂʂʂ

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࣌ܥྻ w 5SBDFVSʹ"OOPUBUJPO͕௥Ճ w &4%FDPSBUPSTͷQSPQPTBM w "U4DSJQUൃද w "U4DSJQUऴྃͷ͓஌Βͤ

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࣌୅͕มΘͬͨͷͰ ࢓ํͳͦ͞͏ ʢ◞‸◟ʣ

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͜ΕΛ౿·͑ͯ NBLF%FDPSBUPSΛ ಡΉͱ

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DMTBOOPUBUJPOT഑ྻͷ୅ΘΓʹ SFqFDUNFUBEBUB࢖ͬͯΔ

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3FqFDUHFU0XO.FUBEBUB Λ ͨͲ͍ͬͯ͘ͱ 8FBL.BQΛ࢖ͬͯ ΦϒδΣΫτຖͷ.FUBEBUBΛ อଘ͍ͯ͠Δ

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NBLF%FDPSBUPSͷ ໾ׂ͸ʜʜʁ

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"OOPUBUJPOͷ࢓૊ΈΛ ࠶ݱ͢Δ

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"OOPUBUJPOͷ࢓૊ΈΛ ࠶ݱ͢Δ BOOPUBUJPO$MT͔Β %FDPSBUPSΛ࡞ͬͯฦ͢

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"OOPUBUJPO୅ΘΓͷ %FDPSBUPSΛ࡞Δ ؔ਺ͩͬͨʂ

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!$PNQPOFOUͷ ࣮૷͸ʁ

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NPEVMFTBOHVMBSTSDDPSF NFUBEBUBUT-- NBLF%FDPSBUPSʹ $PNQPOFOU.FUBEBUBΛ౉ͯ͠Δ

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NPEVMFTBOHVMBSTSDDPSF NFUBEBUBEJSFDUJWFTUT-

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͏Ή

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·ͱΊ

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·ͱΊ w "OOPUBUJPOͱ%FDPSBUPS͸ผ w OH͸ੲ"OOPUBUJPOΛ࢖ͬͯͨ w ݱࡏ͸SFqFDUNFUBEBUBΛ࢖͍  %FDPSBUPSͰ"OOPUBUJPOΛ  ࠶ݱ͍ͯ͠Δ

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ײ૝ w OHɺֶशϦιʔεړΔΑΓ  ຊମίʔυͷίϝϯτಡΜͩ΄͏ָ͕ w SFqFDUNFUBEBUBɺ  8FBL.BQ࢖͑͹͍͍͚ͩͰ͸ʁ w QSPQPTBMग़͢ͷ͸੓࣏త͗͢Δ