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,PJDIJ*50&4. *OD A Practitioner's Journey from Ruby 1.8 to Present Have you been able to craft your job to be fun? େࡕ3VCZձٞ 4BU ϋʔτϯϗςϧ৺ࡈڮদ෩ϗʔϧ

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@koic w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜ wגࣜձࣾӬ࿨γεςϜϚωδϝϯτ &4. *OD 
 ΤϯδχΞϦϯάϚωʔδϟʔ݉ 
 σΟεςΟϯάΠογϡυΤϯδχΞ

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w ʰΦϒδΣΫτࢦ޲εΫϦϓτݴޠ3VCZʱ ͕ڭຊɻʰσεΫτοϓϦϑΝϨϯεʱΛ 
 ࣋ͪา͍ͯ௨ۈͯͨ͠ɻ 3VCZͱࢲ

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େࡕ3VCZձٞͷ&4.ϝϯόʔ 4 Q FBLFS @junk0612 4 Q FBLFS @koic -5 @maimux2x 4 UB f @haruguchiyuma " UUFOEFF @fugakkbn " UUFOEFF @nsgc " UUFOEFF @kakutani ϑΣϩʔ

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w ೔ຊ3VCZΧϯϑΝϨϯε͔Βࠓ೥ͷ 3VCZ,BJHJ·Ͱ͢΂ͯεϙϯαʔͯ͠Δ 
 ੈք།Ұͷاۀ ެืͷͳ͍ আ͘ w 3VCZ,BJHJ -5 -5 ొஃഐग़ w ೔ຊࠃ಺Ͱ͸34QFDͱ)BNMॳظͷಋೖاۀ 3VCZͱ&4. *OD

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044ίϛϡχςΟͱͷڞੜΛࢧԉ 3BJMT044ύονձ #esm_oss

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w !KVOL-SBNBίϯτϦϏϡʔλʔ w !4)QBSTFZίϯτϦϏϡʔλʔ w !LPJD1BSTFSHFNίϛολʔ w !JNB[VNJ*3#ίϛολʔ w !GVHBLLCO3#4ίϯτϦϏϡʔλʔ ߏจղੳثݚڀ෦ IUUQTNBHB[JOFSVCZJTUOFUBSUJDMFT'PMMPX6Q,JSJTIJNB3VCZIUNM /&8

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w3VCZͱΞδϟΠϧιϑτ ΢ΣΞ։ൃΛ௨ͯ͡ίϛϡ χςΟͱ੒௕͍ͨ͠ਓ w೔ຊશࠃ͔Βઈࢍืूத ΤϯδχΞืूத ͜Εɺωλ͡Όͳ͍Ͱ͔͢ΒͶʁ 🗾

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3VCZ࣌୅͔Βݱࡏͷ࠷৽։ൃ൛Ͱ͋Δ 3VCZ·Ͱɺ3VCZͷόʔδϣϯΞοϓʹ ΑͬͯͲͷΑ͏ͳΠϕϯτ͕͋Γɺ౰࣌ͷ࢓ ࣄͰͷΞϓϦέʔγϣϯ։ൃ͋Δ͍͸044 
 ΤίγεςϜͰͲͷΑ͏ͳग़དྷࣄ΍ίʔυ΁ ͷมֵ͕͔͋ͬͨԹނ஌৽Λ͓࿩͠͠·͢ɻ ࠓ೔ͷ࿩ $'1ఏग़֓ཁΑΓ

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ྺ࢙

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#FGPSF3BJMT

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w ຊ൪ϥϯλΠϜʹ3VCZ͕ೖ͍ͬͯͳ͍ w ։ൃ؀ڥͰ͋Ε͹3VCZΛΠϯείͰ͖Δ w +BWBͩͱෳ਺छͷ+&&αʔόʔʹσϓϩΠ͢Δ 
 &"3ϑΝΠϧͷBQQMJDBUJPOYNMͳΜ͔ͷ 
 αʔόʔݻ༗9.-ଐੑͷฤूΛ3&9.-ͰࣗಈԽ w 0ODF8SJUF3VO"OZXIFSF΁ͷάϧʔݴޠ🤔 U%JBSZ͕ΩϥʔΞϓϦ࣌୅

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0.(ʹ࠾୒ʁ !LLE IUUQPCKFDUDMVCKQNMBSDINBHB[JOFIUNM

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"GUFS3BJMT

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w 3BJMTͱ͍͏ࠇધ͕΍͖ͬͯͨ w ౰࣌3BJMTͷ࠾୒͸·ͩϦεΫ w 3BJMTొ৔ͷ౰࣌͸TDB ff PMEͰ·ͱ΋ͳΞϓϦ ࡞ΕΔͷٙ࿭ʁ΍ͬͯΈͨΒશવͰ͖ͨ w ࣮ࡍͷͱ͜ΖTDB ff PME࢖͏ػձ͕ͳ͍Α͏ͳ ͓࢓ࣄͰ3VCZΛΩϝΔ࣌୅

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w 3VCZPO3BJMTͰ΋Γ΋ΓίʔυΛॻ͚ΔΑ ͏ʹͳͬͨ୅ΘΓʹΩϚΓ͗͢ͷΦʔόʔ ϫʔΫʹͳͬͯ͠·ͬͨࣄྫ΋͋Γ w ౰࣌ੜ࢈ੑഒͱݴΘΕ͍ͯͨཪ͸ w 3VCZPO3BJMTͰఆ࣌ʹؼΖ͏"8%X3 Ωϝա͗஫ҙใ͕ग़Δ

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w has_manyͳͲͰݴޠ಺%4-ͷڧྗ͞Λྲྀ෍ w Ҿ਺࠷ޙͷϋογϡͷϒϨʔεͷলུͰ 
 ΩʔϫʔυҾ਺ͬΆ͞ ౰࣌͸=>ه๏ͷΈ w 3BJMTͰಋೖ͞ΕͨSymbol#to_proc͕3VCZ ʹϙʔςΟϯά͞ΕΔ 
 3BJMTʹΑΔ3VCZͷදݱྗ

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͸͡·ΓͷSymbol#to_proc https://github.com/rails/rails/commit/69bf71f5e9b537f88acc0d4492a057336e7305d1

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.FSHF:"37

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w :"37͕ೖͬͯɺ"45ϕʔεͷ௚઀ධՁث͔ Β7.ʹΑΔόΠτίʔυ࣮ߦʹͳͬͨ w άϦʔϯεϨου͔ΒωΠςΟϒεϨουʹ ͳͬͨ (7-͕͋Δ΋ͷͷ*0଴ͪͳͲͷϒ ϩοΫத͸ଞͷεϨου͕࣮ߦͰ͖Δ w ͭ·ΓΞοϓάϨʔυ͢Δͱ଎͘ͳΔ࣌୅ ΞϓϦίʔυԼͰͷมԽ

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w key => valueʹՃ͑key: valueͷ)BTIه๏ಋೖ w ྩ࿨೥ ࣌୅͸3VCZEFW ʹ 
 ʮ3VCZͷ)BTIه๏ʯͱίϝϯτ͢Δ͜ͱ͕ʂ w ΩʔϫʔυҾ਺͕ೖͬͨͷ͸3VCZ͔Β͕ͩɺϝιο υҾ਺ͷ࠷ޙͷϋογϡ͕ຊ౰ʹͦΕͬΆ͘ w ౰࣌ࢍ൱྆࿦ͷlambdaͷ->ه๏͕ೖͬͨ w จࣈͱه߸ͷࣝผௐ࿨͕ઈົ ΞϓϦίʔυ͕ݱ୅తͳݟͨ໨ʹ

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w 3VCZҎલͷจࣈྻ͸όΠτͷγʔέϯε w ⤴Ͱଟ͘ͷEncoding::CompatibilityErrorͱରቂ w # encoding: UTF-8ϚδοΫίϝϯτʹΑΔ 
 εΫϦϓτΤϯίʔσΟϯάͷࢦఆͱ String#force_encodingͳͲʹΑΔετϦʔϜ 
 ΤϯίʔσΟϯάม׵Ͱ৐Γ੾ͬͨΑ͏ͳ w ͓͔͛Ͱ΁ͷΞοϓάϨʔυ͸೉͘͠ͳ͔ͬͨʁ ΞϓϦίʔυ΁ͷඇޓ׵ աڈ࠷େ

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5IF'JSTU4UBCMF

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w 3VCZ(FNT͕ඪ४ఴ෇ʹͳΔ w ruby setup.rbίϚϯυʹΑΔΠϯετʔϧ΍ 
 apt-get install railsͱ͍͏gem؅ཧͱࠞ ͥΔͳةݥͷ౫ଡ w ͜ͷޙ͘Β͍ʹ3BJMTʹ#VOEMFS͕౷߹͞Εͯ ύοέʔδ؅ཧͷΤίγεςϜ͕҆ఆͨ͠ ܥ࠷ॳͷ҆ఆόʔδϣϯ

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.BOZ/FX'FBUVSFT

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w ΩʔϫʔυҾ਺ɺModule#prependɺ 
 γϯϘϧϦςϥϧɺEnumerable#lazyɺ 
 َӢɺTracePointɺ3F fi OFNFOUTͳͲͳͲ w ໿೥ӽ͠ͷΞοϓάϨʔυͰຊ౰ʹ৽ػೳ੝ Γͩ͘͞Μͩͬͨ w ϝλϓϩΪϟϯά΋େتͼʁ ޫͷػೳͱҋͷػೳͨ͘͞Μ

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w εΫϦϓτΤϯίʔσΟϯάͷσϑΥϧτ͕ 65'ʹͳͬͨ ࠓ౓͸Ϛδίϝෆཁ εΫϦϓτΤϯίʔσΟϯάෆཁ

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*NQSPWFNFOUT

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w ΞϓϦ໘Ͱେ͖ͳมߋ͸ࢥ͍ग़ͤͳ͍ վળʹײँ

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4ZNCPM($

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w 3BJMTͰ͸4ZNCPM($ඞਢͷͨΊಋೖ 
 ͞Εͨ3VCZҎ্Λཁٻ͢Δ w ݫີʹ͸όάϑΟοΫεͷҎ্͕ཁ݅ վળʹײँ

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4FWFSBM6TFGVM4ZOUBYFT

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w 4BGF/BWJHBUJPO0QFSBUPS ΅ͬͪԋࢉࢠ 
 ʹΑΔ3BJMTΞϓϦͷtryͱtry!ͷஔ͖׵͑ w .Ͱे෼ͳ৔߹ʹ&.Λكʹݟ͔͚Δ 4BGF/BWJHBUJPO0QFSBUPS

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w 4RVJHHMZ)FSFEPDʹΑΔ3BJMTΞϓϦͷ strip_heredocͷஔ͖׵͑ 4RVJHHMZ)FSFEPD

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• # frozen_string_literal: trueʹΑ ΔϚδοΫίϝϯτͰfreeze͞Εͨ String͕खʹೖΔΑ͏ʹͳͬͨ • RubyͷॊΒ͔͕͞ݮͬͨʁ w ౰࣌෺͕ٞৢ͞Ε͍ͯͨ GTUSJOHMJUFSBMͷಋೖ

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3VCZͰԆظޙͷԻࠫଡ͸ʁ https://mametter.hatenablog.com/entry/20151004/p1

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3BJMTͱGTUSJOHMJUFSBMT https://github.com/rails/rails/pull/30342

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*OUFHFS6OJ fi DBUJPO

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ܯࠂͷ઒͕ྲྀΕΔ w 3VCZͷͱ͖ͱҟͳΓɺ·ͣඇޓ׵΁ͷ 
 ඇਪ঑ܯࠂ͞Ε͍ͯͨ w 3VCZEFWΛ࢖͏͜ͱͰϦϦʔε࣌ ʹ઒ͷ൙ཞ͕ݮΔΑ͏ʹύονΛૹ͍ͬͯͨ

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044ͱ೔ৗ w HIRHFNTSD ؅ཧϦϙδτϦ ͷඇਪ঑ܯࠂ΁ ύονΛग़͢Τί γεςϜࢀՃͷ ͖͔͚ͬʹͳΔ

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*NQSPWFNFOUT

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w rescueelseensure͕doend 
 ϒϩοΫʹॻ͚ΔΑ͏ʹͳͬͨͷ͸ॻ͖৺஍ ྑ͍ վળʹײँ

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.+*53VCZ7."45

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w ͍ͪ͹Μ࣮༻໘ͰӨڹ͍ͯͦ͠͏ w 3VCZΛΠϯετʔϧͨ͠ޙʹ 
 gem i bundlerͱ͍͏ఆܕّྱ͕ෆཁʹ #VOEMFS͕ඪ४ఴ෇͞ΕΔ

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w .+*5͕ಋೖ͞Ε͕ͨɺ3BJMTΞϓϦέʔγϣ ϯͰͷ࣮༻ࣄྫ͸Չฉʹͯ͠ฉ͔ͣͩͬͨ w 3VCZ7."CTUSBDU4ZOUBY5SFFʹΪϟϯά ͕ΞϓϦ৔֎Ͱ੝Γ্͕ΓΛݟ͍ͤͯͨ w ΞϓϦͷ࣮༻໘Ͱ͸FOEMFTTSBOHFͳͲͷ 
 ৽ػೳΛ࢖͑ΔΑ͏ʹͳͬͨ ͍Ζ͍Ζͱ࣮ݧతͳ೩ྉ౤Լ

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4VQFS)BSE.PEF3VCZ

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LXBSHT෼཭ w ͍͍ͩͨฐࣾͷ ύονձʹग़ͯͨ ਓͷपลͰΤί γεςϜଆͷ LXBSHTͷ෼཭ͷ ରԠΛਐΊ͍ͯͨ ҹ৅

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w OVNCFSFEQBSBNFUFSͷελΠϧੋඇʹͭ ͍ͯʮ3VCZ͸8FCΛ࡞ΔͨΊͷݴޠͰ͸ 
 ͳ͘εΫϦϓτݴޠʯͱ͍͏ͷ͸ͳΔ΄Ͳ w ݸਓతʹ͸อक͢Δίʔυʹ͸໊લ͕͍ͭͯ ͍ͯ΋Β͍͍͚ͨΕͲɺॻ͖ࣺͯ΍εϥΠυ ෼ྔΛݮΒ͢ͷʹศར ύλʔϯϚον΍φϯύϥ

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"CTUSBDU*OUFSQSFUBUJPO

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CVHTSVCZMBOHPSHJTTVFT 3VCZݴޠʹ͍͔ͳΔܗͰ͋Εܕએݴ ΍ܕ஫ऍΛಋೖ͢Δͭ΋Γ͸͋Γ·ͤΜ

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w ܕΛॻ͔ͣʹɺܕͷϝϦοτΛڗड͍ͨ͠ w 3#4ͩͱΞϓϦͰ·ͩܕΛॻ͘ίετ͕ߴ͘ ࠳ં͢ΔͷΛݟ͔͚Δ %3:Ͱͳ͘ਏ͍ w 3#*ͷಋೖίʔυ͸΋͸΍3VCZʹݟ͑ͣਏ͍ w ྫ͑͹3#4͕πʔϧؒͷཪଆͷ௿ϨΠϠʔݴޠ ʹͳΔະདྷ͸ʁ ந৅ղऍͱ͍͏ୈͷಓ

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:+*5

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w .+*5ʹՃ͑ͯ-##7ʹج͍ͮͨ4IPQJGZ੡ +*5Ͱ͋Δ:+*5͕ಋೖ͞Εͨ w 3BJMTΞϓϦͰ༗ޮԽͨ͠ޮՌଌఆ͕࿩୊ʹ ͳΔ͜ͱ͕͋Δ͚ΕͲ-41Ͱ΋ΫϥΠΞϯτ ͔ΒRUBY_YJIT_ENABLED=trueͯ͠ΈΑ͏ w FHWTDPEFSVCPDPQ TUFFQWTDPEF :+*5

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3VTU:+*58"4.

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w :+*5ͷ࣮૷͕3VTUʹͳͬͨ w 3VTU:+*5ͷϏϧυͰࠔΔͱ͍͏࿩ΛपลͰ ฉ͔ͳ͍ w %0$,&30''*$*"-*."(&͕࢖ΘΕ͍ͯΔ ͷ͔ɺ3VTUΠϯετʔϧ͸ڭཆͳͷ͔ɺ :+*5ແޮͰͷϏϧυͱ͍ͯ͠Δͷ͔ 3VTU:+*5

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w ࠷ۙ5SZ3VCZͷσϑΥϧτ͕0QBM͔Β 8"4.ʹͳ͍ͬͯͨ ΑΓྑ͍ೖ໳ʹ 8FC"TTFNCMZ 8"4. IUUQTUSZSVCZMBOHPSHQMBZHSPVOE

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w ਖ਼نදݱ·ΘΓվળʹΑΔ3F%P4߈ܸରࡦ ͸࣮༻త w 3FBEPOMZͷStruct.new૬౰ͱͯ͠ Data.define͕ಋೖ͞Εͨ w 3BDUPSͷར༻ʹؔΘ͍͖ͬͯͦ͏ ͷݸਓతਪ͠

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6OJWFSTBM1BSTFS3BDJOH

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-SBNBBOE:"31 6OJWFSTBM1BSTFS೼ݖ૪ୣͷηϝϯτ

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w !KVOL-SBNBίϯτϦϏϡʔλʔ w !4)QBSTFZίϯτϦϏϡʔλʔ w !LPJD1BSTFSHFNίϛολʔ w !JNB[VNJ*3#ίϛολʔ w !GVHBLLCO3#4ίϯτϦϏϡʔλʔ ߏจղੳثݚڀ෦ IUUQTNBHB[JOFSVCZJTUOFUBSUJDMFT'PMMPX6Q,JSJTIJNB3VCZIUNM

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"CPWF"MM .BLF*U'VO