リファクタリングチャンスを探せ

Classi Rails Night #1 2019/11/27 登壇資料
https://connpass.com/event/152405/

Transcript

1. ϦϑΝΫλϦϯάνϟϯεΛ୳ͤʂ ,BPSV
   )PUBUF
   !QVSVOLBPSV $SBTTJ
   3BJMT
   /JHIU
   
    
   DMBTTJ@SBJMT@OJHIU
   1
2. อཱ
   ֜
   ,BPSV
   )PUBUF
   5XJUUFS
   !QVSVOLBPSV
   ϝυϐΞͱ͍͏ձࣾͷ
   ΤϯδχΞͰ͢
   3VCZྺ೥͘Β͍
   ΤϯδχΞྺ೥໨ ࣗݾ঺հ 2
3. ࠓ೔͸ϦϑΝΫλϦϯάͷ࿩Λ͠·͢ʂ 3
4. ϦϑΝΫλϦϯάͷ࿩ͷલʹɾɾɾ
   ࠷ۙͷ೰Έࣄʢ૟আʣΛ࿩͠·͢ 4
6. ‣ झຯɾޘָͷਓ΋͍Δ
   ੒௕ͷͨΊʹ΍Δਓ΋͍Δ
   ΍Β͞Εͯ΍Δਓ΋͍Δ
   ݟͯݟ͵ৼΓΛ͢Δਓ΋͍Δ
   ‣ ϦϑΝΫλϦϯά΋
   ΍Γ͍ͨਓɾզຫͰ͖ͳ͍ਓ͕΍Δʁ
   ‣ ༷ʑͳਓ͕͍ΔதͰɺϦϑΝΫλϦϯάΛ
   ૊৫ϨϕϧͰߦ͏ͷ͸͔ͳΓ೉ͦ͠͏ ϦϑΝΫλϦϯά΋Ұॹʁ 6
7. ‣ ࠓ೔͸ɺϦϑΝΫλϦϯάΛ૊৫Ͱߦ͏ࡍͷ
   ಈػ෇͚ͱࢦ਑ʹয఺Λ౰ͯͯ࿩͠·͢
   ‣ ʮͳͥʯ΍ʮͲ͏΍ͬͯʯͰ͸ͳ͘ɺ
   ʮԿΛʯϦϑΝΫλϦϯά͢Δ͔ʹ͍ͭͯ࿩͠·͢
   ‣ ࣮ફ͍ͯ͠Δํ͸࠶֬ೝͰ͖Δ৔ʹͳΕ͹ͱࢥ͍·͢ ࠓ೔ͷ͓͸ͳ͠ 7
8. 1BSU
   
   ΤϯδχΞνʔϜ಺Ͱͷ
   ϦϑΝΫλϦϯάͷϞνϕʔγϣϯΛ্͛Δ 8
9. ϦϑΝΫλϦϯάΛ΍Δཧ༝ͷେ෦෼͸ɺҎԼͷͭͰ͢
   ‣ ʮ໘നͦ͏ʂʯ
   ྑ͍ઃܭΛҙࣝ͢ΔͷͰɺ੒௕ʹͭͳ͕Δ
   ‣ ʮզຫͰ͖ͳ͍ʂʯ
   ྑ͘ͳ͍ίʔυΛ๾໓ͯ͠ɺਫ਼ਆతॆ଍ײΛಘΔ
   ଞͷਓʹݟΒΕͨ͘ͳ͍ίʔυΛͬͦ͜Γྑ͓ͯ͘͘͠
   
   ϦϑΝΫλϦϯά͕໨తʹͳΓ͕ͪɾɾɾ ϦϑΝΫλϦϯάΛ๻͕΍Δཧ༝ 9
10. ϦϑΝΫλϦϯά͚ͩͷ࣌ؒΛͱΔ͜ͱͰ
    ʮྑ͍ઃܭʯΛҙࣝͯ͠ίʔυΛॻ͘Α͏ʹͳΔ ϦϑΝΫλϦϯά͸੒௕ʹͭͳ͕Δ 10 ϦϑΝΫλϦϯά͕ಘҙʹͳΔͱɺʢதུʣѱ͍ίʔυΛॻ͘ͷΛ΍Ίɺ
    ѱ͍׳शʹै͏ͷΛ΍ΊɺϓϨϑΝΫλϦϯάΛ࢝ΊΔͷͩɻʢதུʣ
    ίʔυͷϦϑΝΫλϦϯά͸ɺίʔυΛॻ͘ͱ͖ʹͯ͠͸͍͚ͳ͍͜ͱɺ
    ୅ΘΓʹ͢΂͖͜ͱΛֶͿ্Ͱ࠷଎ͷํ๏ͷͭͳͷͩɻ %BWJE
    4DPUU
    #FSOTUFJO
    ஶʮϨΨγʔίʔυ͔Βͷ୤٫ʯΑΓ
11. ྑ͍ઃܭΛ࣮ײ͢Δ࢓૊Έ͕ඞཁ 11 ‣ ڠྗ͠߹͏
    ‣ ϖΞϓϩɾϞϒϓϩ
    ‣ ٕज़ސ໰
    ‣ ϧʔϧʹଇΔ
    ‣ 40-*%ݪଇ
    ‣ ˓˓ύλʔϯ
12. ‣ 'BU
    .PEFMͷղফύλʔϯΛ
    ͭͷࣄྫʹ෼͚ͯ঺հ͍ͯ͠·͢
    IUUQTTQFBLFSEFDLDPNIPUBUFLBPSVGBUNPEFMOJEVJDIVTVSVUVGBMTFSJIVBLVUBSJOHVQBUBO 'BU
    .PEFM
    ͷղফύλʔϯ 12
13. ‣ ϦϑΝΫλϦϯά͸୹ظతʹ͓ۚΛੜΈग़ͮ͠Β͍΋ͷ
    ‣ ΍Γͨͯ͘΋ඇΤϯδχΞ͔Βཧղ͕ಘΒΕͳ͍
    ݁Ռ΍Ε͍ͯͳ͍ਓ͕ଟ͍ͷͰ͸ʁ
    ࣮ࡍ͸ɾɾɾ 13
14. 1BSU
    
    ඇΤϯδχΞʹ΋
    ϦϑΝΫλϦϯάΛཧղͯ͠΋Β͏ 14
15. ͚ͩ͜͜ͷ࿩Ͱ͕͢ɺ
    ؆୯ͳํ๏Λݟ͚ͭ·ͨ͠ 15
16. ΠϯύΫτͷ͋Δʮ΍Β͔͠ʯΛ͢Ε͹0,
    
    
    ˞੹೚͸औΓ·ͤΜ 16
17. ‣ ϦϑΝΫλϦϯάͱ͍͏޻਺͸ɺ
    ୹ظతʹपΓʹධՁ͞ΕͮΒ͍
    ཧղΛಘͮΒ͍
    ‣ ධՁɾཧղΛಘΔͨΊʹ͸ɺ਺ࣈ͕ඞཁ
    ‣ ඇΤϯδχΞͷཧղΛಘΔͨΊʹ͸
    ఆྔతʹ੒ՌΛग़ͤΔՕॴ͔Β
    ϦϑΝΫλϦϯά͠·͠ΐ͏ ϦϑΝΫλϦϯάͷ੒ՌΛ໌֬ʹ͠Α͏ 17
18. ‣ ϨεϙϯελΠϜ
    ‣ ςετͷ࣮ߦ଎౓
    ‣ ίʔυͷ඼࣭
    ‣ $PEF
    $MJNJBUF
    ‣ SVCZDSJUJD
    ‣ ίʔυͷՄಡੑ
    ‣ $POUSPMMFSͷߦ਺
    ‣ 3VCPDPQͷEJTBCMF਺ ϦϑΝΫλϦϯάͷఆྔతͳ੒Ռ 18
19. ‣ /FX
    3FMJD΍4LZMJHIUͰ
    ϨεϙϯελΠϜ͕஗͍ॲཧΛௐࠪ
    ‣ मਖ਼ྫ
    ‣ / Λແ͘͢
    ‣ ൃߦ͞ΕΔΫΤϦΛνϡʔχϯά͢Δ
    ‣ ඇಉظʹͰ͖Δॲཧ͸ඇಉظʹ͢Δ
    ‣ ஗͍ॲཧΛݺͼग़͢ճ਺ΛݮΒ͢
    ‣ SFEJT
    
    NFNDBDIFE
    ϦϑΝΫλϦϯάͷ,1*ྫʢϨεϙϯελΠϜʣ 19
20. ‣ ѹ౗తʹ஗͍ͷ͸ɺKT
    USVFͳ
    &&ͷςετ
    ‣ KTଆͷϩδοΫΛKFTUͳͲͷKTςετʹدͤΔ
    ‣ $POUSPMMFSͷϩδοΫΛ.PEFMଆʹدͤΔ
    ‣ ͨ·ʹམͪΔςετͷ࡟আ ϦϑΝΫλϦϯάͷ,1*ྫʢςετͷ࣮ߦ଎౓ʣ 20
21. ‣ ෳ਺Օॴͷڞ௨ϩδοΫʢίϐϖʣΛݮΒ͢
    ‣ ෳࡶͳ࣮૷ΛݮΒ͢
    मਖ਼ྫ
    ‣ $PEF
    $MJNBUFͷධՁΛ্͛Δ
    ‣ SVCZDSJUJD
    ͷධՁΛ্͛Δ ϦϑΝΫλϦϯάͷ,1*ྫʢίʔυͷ඼࣭ΛߴΊΔʣ 21
22. https://codeclimate.com/ ‣ Φʔϓϯιʔε͸ແྉ
    ‣ ೔ؒͷτϥΠΞϧظؒ͋Γ
    ͦͷ͋ͱ͸༗ྉ
    ‣ ࣌ؒʹ༨༟͕͋Ε͹ը໘ݟͤΔ $PEF
    $MJNBUF 22
23. https://github.com/whitesmith/rubycritic ‣ ࣌ؒʹ༨༟͕͋Ε͹ը໘ݟͤΔ SVCZDSJUJD 23
24. ‣ ʮඞཁʹഭΒΕΔલʹʯՄಡੑΛߴΊΔमਖ਼Λߦ͏
    ‣ ඇΤϯδχΞ΁ͷཧղ͸ඞཁ
    मਖ਼ྫ
    ‣ $POUSPMMFSͷߦ਺ΛݮΒ͢
    ‣ 3VCPDPQͷEJTBCMF਺ΛݮΒ͢
    ‣ .PEFMͷॲཧΛผΫϥεʹҕৡ͢Δ ϦϑΝΫλϦϯάͷ,1*ྫʢՄಡੑΛߴΊΔʣ 24
25. ‣ ϦϑΝΫλϦϯά͸ΤϯδχΞͱͯ͠ͷ੒௕ʹͭͳ͕Δ
    ‣ ΤϯδχΞ͕ࣗൃతʹϦϑΝΫλϦϯά͢ΔͨΊʹ͸ɺ
    ੒௕Λ࣮ײͰ͖Δ࢓૊Έ͕ඞཁ
    ‣ ඇΤϯδχΞʹϦϑΝΫλϦϯά޻਺Λ
    ཧղͯ͠΋Β͏ͨΊʹ͸ɺ
    ਺஋Ͱ੒ՌΛใࠂͰ͖ΔϦϑΝΫλϦϯά͕ඞཁ ·ͱΊ 25
26. ࢀߟจݙ 26 ‣ ϨΨγʔίʔυ͔Βͷ୤٫
    
    ʕιϑτ΢ΣΞͷण໋ΛԆ͹͠
    Ձ஋ΛߴΊΔͭͷϓϥΫςΟε
    %BWJE
    4DPUU
    #FSOTUFJO
    ஶ
27. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ 27