リファクタリングチャンスを探せ

by Kaoru Hotate

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ϦϑΝΫλϦϯάνϟϯεΛ୳ͤʂ ,BPSV)PUBUF!QVSVOLBPSV $SBTTJ3BJMT/JHIU DMBTTJ@SBJMT@OJHIU 1

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อཱ֜ ,BPSV)PUBUF 5XJUUFS!QVSVOLBPSV ϝυϐΞͱ͍͏ձࣾͷ ΤϯδχΞͰ͢ 3VCZྺ೥͘Β͍ ΤϯδχΞྺ೥໨ ࣗݾ঺հ 2

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ࠓ೔͸ϦϑΝΫλϦϯάͷ࿩Λ͠·͢ʂ 3

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ϦϑΝΫλϦϯάͷ࿩ͷલʹɾɾɾ ࠷ۙͷ೰Έࣄʢ૟আʣΛ࿩͠·͢ 4

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‣ झຯɾޘָͷਓ΋͍Δ ੒௕ͷͨΊʹ΍Δਓ΋͍Δ ΍Β͞Εͯ΍Δਓ΋͍Δ ݟͯݟ͵ৼΓΛ͢Δਓ΋͍Δ ‣ ϦϑΝΫλϦϯά΋ ΍Γ͍ͨਓɾզຫͰ͖ͳ͍ਓ͕΍Δʁ ‣ ༷ʑͳਓ͕͍ΔதͰɺϦϑΝΫλϦϯάΛ ૊৫ϨϕϧͰߦ͏ͷ͸͔ͳΓ೉ͦ͠͏ ϦϑΝΫλϦϯά΋Ұॹʁ 6

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‣ ࠓ೔͸ɺϦϑΝΫλϦϯάΛ૊৫Ͱߦ͏ࡍͷ ಈػ෇͚ͱࢦ਑ʹয఺Λ౰ͯͯ࿩͠·͢ ‣ ʮͳͥʯ΍ʮͲ͏΍ͬͯʯͰ͸ͳ͘ɺ ʮԿΛʯϦϑΝΫλϦϯά͢Δ͔ʹ͍ͭͯ࿩͠·͢ ‣ ࣮ફ͍ͯ͠Δํ͸࠶֬ೝͰ͖Δ৔ʹͳΕ͹ͱࢥ͍·͢ ࠓ೔ͷ͓͸ͳ͠ 7

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1BSU ΤϯδχΞνʔϜ಺Ͱͷ ϦϑΝΫλϦϯάͷϞνϕʔγϣϯΛ্͛Δ 8

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ϦϑΝΫλϦϯάΛ΍Δཧ༝ͷେ෦෼͸ɺҎԼͷͭͰ͢ ‣ ʮ໘നͦ͏ʂʯ ྑ͍ઃܭΛҙࣝ͢ΔͷͰɺ੒௕ʹͭͳ͕Δ ‣ ʮզຫͰ͖ͳ͍ʂʯ ྑ͘ͳ͍ίʔυΛ๾໓ͯ͠ɺਫ਼ਆతॆ଍ײΛಘΔ ଞͷਓʹݟΒΕͨ͘ͳ͍ίʔυΛͬͦ͜Γྑ͓ͯ͘͘͠ ϦϑΝΫλϦϯά͕໨తʹͳΓ͕ͪɾɾɾ ϦϑΝΫλϦϯάΛ๻͕΍Δཧ༝ 9

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ϦϑΝΫλϦϯά͚ͩͷ࣌ؒΛͱΔ͜ͱͰ ʮྑ͍ઃܭʯΛҙࣝͯ͠ίʔυΛॻ͘Α͏ʹͳΔ ϦϑΝΫλϦϯά͸੒௕ʹͭͳ͕Δ 10 ϦϑΝΫλϦϯά͕ಘҙʹͳΔͱɺʢதུʣѱ͍ίʔυΛॻ͘ͷΛ΍Ίɺ ѱ͍׳शʹै͏ͷΛ΍ΊɺϓϨϑΝΫλϦϯάΛ࢝ΊΔͷͩɻʢதུʣ ίʔυͷϦϑΝΫλϦϯά͸ɺίʔυΛॻ͘ͱ͖ʹͯ͠͸͍͚ͳ͍͜ͱɺ ୅ΘΓʹ͢΂͖͜ͱΛֶͿ্Ͱ࠷଎ͷํ๏ͷͭͳͷͩɻ %BWJE4DPUU#FSOTUFJOஶʮϨΨγʔίʔυ͔Βͷ୤٫ʯΑΓ

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ྑ͍ઃܭΛ࣮ײ͢Δ࢓૊Έ͕ඞཁ 11 ‣ ڠྗ͠߹͏ ‣ ϖΞϓϩɾϞϒϓϩ ‣ ٕज़ސ໰ ‣ ϧʔϧʹଇΔ ‣ 40-*%ݪଇ ‣ ˓˓ύλʔϯ

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‣ 'BU.PEFMͷղফύλʔϯΛ ͭͷࣄྫʹ෼͚ͯ঺հ͍ͯ͠·͢ IUUQTTQFBLFSEFDLDPNIPUBUFLBPSVGBUNPEFMOJEVJDIVTVSVUVGBMTFSJIVBLVUBSJOHVQBUBO 'BU.PEFMͷղফύλʔϯ 12

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‣ ϦϑΝΫλϦϯά͸୹ظతʹ͓ۚΛੜΈग़ͮ͠Β͍΋ͷ ‣ ΍Γͨͯ͘΋ඇΤϯδχΞ͔Βཧղ͕ಘΒΕͳ͍ ݁Ռ΍Ε͍ͯͳ͍ਓ͕ଟ͍ͷͰ͸ʁ ࣮ࡍ͸ɾɾɾ 13

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1BSU ඇΤϯδχΞʹ΋ ϦϑΝΫλϦϯάΛཧղͯ͠΋Β͏ 14

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͚ͩ͜͜ͷ࿩Ͱ͕͢ɺ ؆୯ͳํ๏Λݟ͚ͭ·ͨ͠ 15

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ΠϯύΫτͷ͋Δʮ΍Β͔͠ʯΛ͢Ε͹0, ˞੹೚͸औΓ·ͤΜ 16

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‣ ϦϑΝΫλϦϯάͱ͍͏޻਺͸ɺ ୹ظతʹपΓʹධՁ͞ΕͮΒ͍ ཧղΛಘͮΒ͍ ‣ ධՁɾཧղΛಘΔͨΊʹ͸ɺ਺ࣈ͕ඞཁ ‣ ඇΤϯδχΞͷཧղΛಘΔͨΊʹ͸ ఆྔతʹ੒ՌΛग़ͤΔՕॴ͔Β ϦϑΝΫλϦϯά͠·͠ΐ͏ ϦϑΝΫλϦϯάͷ੒ՌΛ໌֬ʹ͠Α͏ 17

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‣ ϨεϙϯελΠϜ ‣ ςετͷ࣮ߦ଎౓ ‣ ίʔυͷ඼࣭ ‣ $PEF$MJNJBUF ‣ SVCZDSJUJD ‣ ίʔυͷՄಡੑ ‣ $POUSPMMFSͷߦ਺ ‣ 3VCPDPQͷEJTBCMF਺ ϦϑΝΫλϦϯάͷఆྔతͳ੒Ռ 18

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‣ /FX3FMJD΍4LZMJHIUͰ ϨεϙϯελΠϜ͕஗͍ॲཧΛௐࠪ ‣ मਖ਼ྫ ‣ /Λແ͘͢ ‣ ൃߦ͞ΕΔΫΤϦΛνϡʔχϯά͢Δ ‣ ඇಉظʹͰ͖Δॲཧ͸ඇಉظʹ͢Δ ‣ ஗͍ॲཧΛݺͼग़͢ճ਺ΛݮΒ͢ ‣ SFEJTNFNDBDIFE ϦϑΝΫλϦϯάͷ,1*ྫʢϨεϙϯελΠϜʣ 19

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‣ ѹ౗తʹ஗͍ͷ͸ɺKTUSVFͳ&&ͷςετ ‣ KTଆͷϩδοΫΛKFTUͳͲͷKTςετʹدͤΔ ‣ $POUSPMMFSͷϩδοΫΛ.PEFMଆʹدͤΔ ‣ ͨ·ʹམͪΔςετͷ࡟আ ϦϑΝΫλϦϯάͷ,1*ྫʢςετͷ࣮ߦ଎౓ʣ 20

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‣ ෳ਺Օॴͷڞ௨ϩδοΫʢίϐϖʣΛݮΒ͢ ‣ ෳࡶͳ࣮૷ΛݮΒ͢ मਖ਼ྫ ‣ $PEF$MJNBUFͷධՁΛ্͛Δ ‣ SVCZDSJUJDͷධՁΛ্͛Δ ϦϑΝΫλϦϯάͷ,1*ྫʢίʔυͷ඼࣭ΛߴΊΔʣ 21

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https://codeclimate.com/ ‣ Φʔϓϯιʔε͸ແྉ ‣ ೔ؒͷτϥΠΞϧظؒ͋Γ ͦͷ͋ͱ͸༗ྉ ‣ ࣌ؒʹ༨༟͕͋Ε͹ը໘ݟͤΔ $PEF$MJNBUF 22

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https://github.com/whitesmith/rubycritic ‣ ࣌ؒʹ༨༟͕͋Ε͹ը໘ݟͤΔ SVCZDSJUJD 23

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‣ ʮඞཁʹഭΒΕΔલʹʯՄಡੑΛߴΊΔमਖ਼Λߦ͏ ‣ ඇΤϯδχΞ΁ͷཧղ͸ඞཁ मਖ਼ྫ ‣ $POUSPMMFSͷߦ਺ΛݮΒ͢ ‣ 3VCPDPQͷEJTBCMF਺ΛݮΒ͢ ‣ .PEFMͷॲཧΛผΫϥεʹҕৡ͢Δ ϦϑΝΫλϦϯάͷ,1*ྫʢՄಡੑΛߴΊΔʣ 24

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‣ ϦϑΝΫλϦϯά͸ΤϯδχΞͱͯ͠ͷ੒௕ʹͭͳ͕Δ ‣ ΤϯδχΞ͕ࣗൃతʹϦϑΝΫλϦϯά͢ΔͨΊʹ͸ɺ ੒௕Λ࣮ײͰ͖Δ࢓૊Έ͕ඞཁ ‣ ඇΤϯδχΞʹϦϑΝΫλϦϯά޻਺Λ ཧղͯ͠΋Β͏ͨΊʹ͸ɺ ਺஋Ͱ੒ՌΛใࠂͰ͖ΔϦϑΝΫλϦϯά͕ඞཁ ·ͱΊ 25

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ࢀߟจݙ 26 ‣ ϨΨγʔίʔυ͔Βͷ୤٫ ʕιϑτ΢ΣΞͷण໋ΛԆ͹͠ Ձ஋ΛߴΊΔͭͷϓϥΫςΟε %BWJE4DPUU#FSOTUFJOஶ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ 27