rubocop-headquarters-2018.pdf

Rails Developers Meetup 2018 Day 3 Extreme (https://techplay.jp/event/679666)

Transcript

1. 
   4BU 3VCP$PQ
   )FBERVBSUFST 3BJMT
   %FWFMPQFST
   .FFUVQ
   
   %BZ
   
   &YUSFNF %3&$0.
   $P
   -UE The road to RuboCop 1.0 after RubyKaigi 2018 ,PJDIJ
   *50
   
   FTN
2. !LPJD w 3VCP$PQ
   DPNNJUUFS
   w "3
   0SBDMF
   FOIBODFE
   BEBQUFS
   DPNNJUUFS
   w &JXB
   4ZTUFN
   .BOBHFNFOU
   *OD
3. !FTNJOD -VODI
   4QPOTPS )FSF
4. 3BJMTEN
   BOE
   NF
5. 3BJMTEN
   
6. 3BJMTEN
   
7. 3BJMTEN
   
   EBZ
8. 3BJMTEN
   
   EBZ
12. 3BJMTίϛϡχςΟҭͪͷࢹ఺
13. 
    4BU 3VCP$PQ
    )FBERVBSUFST 3BJMT
    %FWFMPQFST
    .FFUVQ
    
    %BZ
    
    &YUSFNF %3&$0.
    $P
    -UE The road to RuboCop 1.0 after RubyKaigi 2018 ,PJDIJ
    *50
    
    FTN
14. ࠓ೔ͷ࿩
15. IUUQTTQFBLFSEFDLDPNLBLVUBOJBHJMFNBOJGFTUPEFDBEF TMJEF !LBLVUBOJ
16. w"CPVU
    3VCP$PQ
    )2
    w5IF
    SPBE
    UP
    3VCP$PQ
    
    BGUFS
    3VCZ,BJHJ
     "HFOEB
17. 1FPQMF 1SPEVDU
18. 1FPQMF
19. w ೥݄೔ʹདྷ೔͍ͯͨ͠
    !CCBUTPW
    ʹΑͬͯެ։͞ΕΔ
    w (JU)VC্ʹ෼ࢄ͍ͯͨ͠(BOH
    PG
    3VCP$PQΛ౷ׅ͍ͯ͠Δ
    (JU)VC
    PSHBOJ[BUJPO
    w "
    OFX
    044
    DPNNVOJUZ 3VCP$PQ
    )FBERVBSUFST
20. HJUIVCDPNSVCPDPQIR
22. w 3VCP$PQ
    $PSF
    w 3VCP$PQ
    1FSGPSNBODF
    w 3VCP$PQ
    3BJMT
    w 3VCP$PQ
    34QFD
    w 3VCZ
    4UZMF
    (VJEF
    w 3BJMT
    4UZMF
    (VJEF
    w 3VCP$PQ
    +1
    w FUD 3VCP$PQ
    )2ͷSFQP
23. w ෼ࢄͨ͠ෳ਺ͷݸਓϦϙδτϦ͔Β ͍ͪίϛϡχςΟͷϦϙδτϦ΁
    w ݸਓϦϙδτϦͷਓ͕ͨͪ)2ʹू ·͖ͬͯͨ 044ίϛϡχςΟͷৢ଄
24. w 3VCP$PQ
    $PSFΛத৺ʹؔ৺ͷ͋ Δϝϯόʔɺ3VCP$PQ
    34QFDΛ த৺ʹ׆ಈ͍ͯ͠Δϝϯόʔ
    w ͢΂ͯͷϦϙδτϦʹίϛοτݖ͕͋ ΔΘ͚Ͱ͸ͳ͍
    w ྫ͑͹ࢲ͸
    $PSF
    
    1FSGPSNBODF
    
    3BJMT
    
    +1 ϝϯόʔ͝ͱͷྖҬͷҧ͍
25. w $PSF
    ͸
    CCBUTPWSVCPDPQ
    ͩͬ ͨ΋ͷͰɺ͍ΘΏΔ
    3VCP$PQ
    ͱݺ ͹Ε͍ͯΔ΋ͷͷத৺
    w 3VCP$PQ
    34QFDͳͲ֦ு$PQ͕ ґଘ͍ͯ͠Δ֦ுݩ
    (FN
    ͷଆ໘
    w $PSFͰܧঝʹؔ͢ΔΠϯλϑΣʔε ͕มΘΔͱ֦ு$PQ͸ӨڹΛड͚Δ ֦ுݩ$PQͱͯ͠ͷ$PSF
26. w ͜͜Ұ೥ͷഁյతมߋͱͯ͠͸ /PEF1BUUFSO
    ͷ
    OJM
    ΁ͷมߋ΍
    3VCP$PQ$PQ
    ͔Βͷ
    3BOHF)FMQ
    Ϟδϡʔϧ੾Γग़͠ ͕͋Δ
    ֤֦ு
    (FN
    ͸௥ਵ͕ඞཁ
    w ؔ৺ͷ͋Δϝϯόʔ͕
    )2
    ʹू·ͬ ͨͷ͸ྑ͍࿩ ҟͳΔϓϩδΣΫτؒͰͷಉظ
27. w ίϯτϦϏϡʔλʹൺ΂ͯ΍ΕΔ͜ ͱ͕૿͑Δ
    w ίϛολʔʹͳͬͯվΊͯࢥͬͨ͜ Ε·Ͱͱ͜Ε͔Β
    w (JU)VCϕʔεͷ3BJMTίϛϡχ ςΟͱൺֱ )2
    ઃཱͱಉ࣌ʹίϛολʔʹͳͬͨ
28. 044ίϛϡχςΟʹΑΔҧ͍ SBJMTSBJMT CCBUTPWSVCPDPQ 3FWJFX ؔ৺Λ࣋ͬͨਓ ؔ৺Λ࣋ͬͨਓ $MPTF
    JTTVF *TTVFνʔϜɺίϛολʔɺί Ξϝϯόʔ ίϛολʔ .FSHF
    13 ίϛολʔɺίΞϝϯόʔ ΄΅ϦϙδτϦΦʔφʔ NBTUFS
    QVTI ίϛολʔɺίΞϝϯόʔ ϦϙδτϦΦʔφʔͷΈ
    ؍ଌൣғ 3FMFBTF ϦϦʔεϚωʔδϟ ϦϙδτϦΦʔφʔ
29. ࢲ͕ۙະདྷʹඳ͘3VCP$PQ
    )2ͷੈք؍ SBJMTSBJMT SVCPDPQIRSVCPDPQ 3FWJFX ؔ৺Λ࣋ͬͨਓ ؔ৺Λ࣋ͬͨਓ $MPTF
    JTTVF *TTVFνʔϜɺίϛολʔɺί Ξϝϯόʔ ίϛολʔ .FSHF
    13 ίϛολʔɺίΞϝϯόʔ ίϛολʔ NBTUFS
    QVTI ίϛολʔɺίΞϝϯόʔ ίϛολʔ 3FMFBTF ϦϦʔεϚωʔδϟ ϔουϝϯςφʔ
    0S
30. SVCPDPQIRSVCPDPQ %SPQ
    TVQQPSU
    GPS
    .3*
    
31. w HJU
    QVTI
    PSJHJO
    NBTUFS
    ʹͭ ͍ͯ
    w جຊ͸
    1VMM
    3FRVFTU
    Λ։͘
    w ໌നͳ
    $PTNFUJD
    DIBOHF
    ͸
    NBTUFS
    QVTI
    Ͱྑ͍ͷͰ͸ʁ ίϛολʔͷݖརͱن཯
33. w ΍ͬͯΈͤ HJU
    QVTI
    PSJHJO
    NBTUFS git push origin master
34. SVCPDPQIRSVCPDPQ!GGBF 'JY
    $)"/(-0(NE
37. IUUQTUXJUUFSDPNLPJDTUBUVT
38. w lNBTUFS
    QVTI
    ͢Δͱ͖͸
    13
    Λ ૹΔͱ͖ΑΓ΋৻ॏʹ΍͍ͬͯΔz
    w l࣌ؒʹ௥ΘΕͯΔͱ͖͸΍Βͳ͍z
    w l ϛεͨ͋͠ͱ
    NBTUFS
    QVTIͷ จԽΛ࡞ΔͳΒઆ໌͸͏·͍͜ͱ͢ Δඞཁ͕͋Δz 3BJMTίϛολʔ͔Βͷॿݴ
41. ͔͜͜Βগ͠ ৽ͨͳࢀೖ΁ͷώϯτ
42. ਓࡐ͸༗ݶͰ ͋Γྲྀಈ͢Δ IUUQTHJUIVCDPNSVCPDPQIRSVCPDPQJTTVFTJTTVFDPNNFOU
43. w 5IF
    3BJMT
    %PDUSJOF
    
    w ҟͳΔࢹ఺ɺ৽ͨͳίϛϡχςΟϝ ϯόʔΛܴ͑ೖΕΔ
    w HPPE
    pSTU
    JTTVF
    w 3VCP$PQ
    +1 l1VTI
    VQ
    B
    CJH
    UFOUz
45. HPPE
    pSTU
    JTTVF
46. lHPPE
    pSTU
    JTTVFz
47. 3VCP$PQ
    +1
49. w ͍͖ͳΓ೉͍͠໰୊Λղ͜͏ͱ͠ͳ͍
    w lHPPE
    pSTU
    TUFQz
    ͸͸͡ΊͷҰา΁ ͷΦεεϝͷϥϕϧ
    w ِཅੑ΍Τϥʔʹ͍ͭͯΠγϡʔΛ։͘ ͜ͱʹΑͬͯࢀՃ͢Δͱ͍͏Ұา໨
    w ΠγϡʔςϯϓϨʔτʹ४͡Δͱ(PPE 044ίϛϡχςΟ΁ͷࢀՃͷҰา
50. QPDLF .Z
    HPBM
    GPS
    UIJT
    PSHBOJ[BUJPO
    JT
    UP
    CFDPNF
    UIF
    DFOUSBM
    IVC
    GPS
    BMM
    UIF
    DPSF
    3VCP$PQ
    SFMBUFE
    BDUJWJUJFT
    *
    XBOU
    VT
    UP
    CVJME
    B
    CJHHFS
    DPSF
    UFBN
    TOJQ
    *U
    IBTO`U
    CFFO
    B
    QFSTPOBM
    QSPKFDU
    PG
    NJOF
    GPS
    RVJUF
    B
    XIJMF
    *G
    TP
    NBOZ
    QFPQMF
    BSF
    VTJOH
    JU
    JG
    TP
    NBOZ
    UIJOHT
    BSF
    OFFEFE
    UP
    CF
    EPOF
    UIJT
    CFMPOHT
    UP
    UIF
    DPNNVOJUZ IUUQTCMPHTJEFDJDPNJOUFSWJFXXJUICP[IJEBSCBUTPWCCGEB :FTUFSEBZ
    ZPV
    NPWFE
    3VCP$PQ
    SFQPTJUPSZ
    GSPN
    VOEFS
    CCBUPTW
    UP
    SVCPDPQIR
    
    TOJQ
    $BO
    ZPV
    UFMM
    VT
    PUIFS
    QMBOT
    GPS
    UIF
    PSHBOJ[BUJPO CCBUTPW *OUFSWJFX
    XJUI
    #P[IJEBS
    #BUTPW
    1SFTFOUFE
    CZ
    4JEFS
    5FBN
51. 1SPEVDU
52. IUUQTXXXZPVUVCFDPNXBUDI WOS)K7$V7T("
53.  &YUSBDU
    3BJMT
    $PQT
    JO
    B
    TFQBSBUF
    
     &YUSBDU
    1FSGPSNBODF
    $PQT
    JOUP
    B
    TFQBSBUF
    HFN
    
     &YUFOE
    DPQ
    NFUBEBUB
    
     *OUSPEVDF
    OFX
    DPQT
    XJUI
    B
    TQFDJBM
    TUBUVT
    JOTUFBE
    PG
    FOBCMFEEJTBCMFE
    
     *NQMFNFOU
    PQUJPOT
    UP
    SVO
    POMZ
    TBGF
    DPQT
    BOE
    TBGF
    BVUPDPSSFDUT
     #JH
    NJMFTUPOF
    UP
    3VCP$PQ
    
54. SVCPDPQIRSVCPDPQ &YUSBDU
    3BJMT
    $PQT
    JO
    B
    TFQBSBUF
56. w 3VCP$PQࣗମ͸ϑϨʔϜϫʔΫ ϥΠϒϥϦϥϯλΠϜʹґଘͤͣ 3VCZʹϑΥʔΧε͍ͨ͠
    w ࡞ऀͱͯ͠ɺ͍·͸3BJMTΛ͋·Γ ΍͍ͬͯͳ͍Β͍͠
    w ͨͷ·Ε·ͨ͠ 5-%3
57. w SVCPDPQSBJMT
    ͱ͍͏
    HFN
    ͸ طʹଘࡏ͍ͯ͠Δ ΤίγεςϜ্ͷ՝୊
60. w SBJMTSBJMT
    ͷ
    SVCPDPQZNM
    Λ൓ө͠ ͨ
    SE
    QBSUZ
    DPQ
    w 3VCZ,BJHJ
    
    Ͱ
    CCBUTPW
    ͞Μʹ
    ZBIPOEB
    ͞Μ͕࿩Λͯ͘͠Εͨ
    w 3VCZ,BJHJ
    ޙʹ
    %SFONJ
    ͞ΜΒ͔Βϝ ϯγϣϯ͕͋Δ
    w 13
    Λૹ͍ͬͯͨࢲʹҾ͖ܧ͗ ྲྀΕ
65. !UPTIJNBSV͞Μ͋Γ͕ͱ͏͍͟͝·͢ʂ
66. w 3VCP$PQ
    ͷ
    3BJMT
    ෦ॺʹ͍ͭͯ ελϒʹͯ͠ɺSVCPDPQSBJMT
    HFN
    ͷ௥ՃΛଅ͢ϩάΛग़ྗ͢Δ
    w ͋Δ͍͸
    3VCP$PQ
    3BJMT
    ʹ ϑΥʔϧόοΫ͢Δ 3VCP$PQ
    3BJMT΁ͷҠߦ
67. SVCPDPQIRSVCPDPQ &YUSBDU
    1FSGPSNBODF
    $PQT
    JOUP
    B
    TFQBSBUF
    HFN
69. w ύϑΥʔϚϯεޮ཰ʹ͍ͭͯ
    .3*
    ʹಛԽͨ͠಺༰ʹͳ͍ͬͯΔ
    w 3VCP$PQ
    ͸
    +3VCZ
    ΋αϙʔτ ͍ͯ͠Δ
    w 3VCP$PQ
    $PSF
    ͱͯ͠͸ॲཧܥ ʹґଘ͠ͳ͍ܗΛࢦ޲͍ͯ͠Δ 5-%3
71. w ࣮ࡍͷޮՌʹ͍ͭͯ͸ɺެࣜυΩϡ ϝϯτͷϦϑΝϨϯεʹه͞Ε͍ͯ Δ৔߹͕͋Δ
    w ࠾୒Λ೰Μͩ࣌͸Ұಡ͔ͯ͠Β࣮ߦ ΛࢼΈͯ΋ྑͦ͞͏ 5JQT
    PG
    1FSGPSNBODF
    DPQ
72. 1FSGPSNBODF4BNQMF
73. +VBOJUP'BUBTGBTUSVCZ
74. SBJMTSBJMT
75. CFODINBSLJQT
76. $PNQBSJTPO % ruby -v shuffle-first-vs-sample.rb ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64- darwin17] Warming up -------------------------------------- Array#shuffle.first 35.171k i/100ms Array#sample 229.945k i/100ms Calculating ------------------------------------- Array#shuffle.first 400.180k (± 5.9%) i/s - 2.005M in 5.026934s Array#sample 6.407M (± 6.4%) i/s - 31.962M in 5.010117s Comparison: Array#sample: 6407183.3 i/s Array#shuffle.first: 400180.2 i/s - 16.01x slower
77. w !DPNQPTFSJOUFSBMJB
    ͕ਐΊͯ ͘Ε͍ͯΔ
    w 3VCP$PQ
    
    ʹ޲͚ͯ
    3VCP$PQ
    3BJMT
    ಉ༷ਐḿ͍ͯ͠Δ
    w ͠͹Β͘
    3VCP$PQ
    $PSF
    ͱͷಉ ظ͕৬ਓͷԹ͔ͳख࡞ۀ
    1FSGPSNBODF
    DPQTͷநग़ঢ়گ
78. SVCPDPQIRSVCPDPQ &YUFOE
    DPQ
    NFUBEBUB
80. w ͓ͦΒ͘
    3VCP$PQ
    
    ͷ໨ۄ
    w 3VCP$PQ
    ΛΞοϓάϨʔυͨ͠ࡍʹ ރΕ͍ͯͳ͍
    $PQ
    Ͱͷ໰୊͕͋ͬͨΓ
    CSFBLJOH
    DIBOHF
    ͨ͠Γͷ൵͠Έ ͷ͓ศΓ΁ͷػೳ
    w SVCPDPQZNM
    EFGBVMUZNM
    ΁ͷ ϝλσʔλͷ௥Ճ 5-%3
81. w 7FSTJPO"EEFE
    ʜ
    $PQ͕௥Ճ͞Εͨόʔδϣ ϯ
    w 7FSTJPO$IBOHFE
    ʜ
    ϢʔβʔʹӨڹͷ͋Δόʔ δϣϯ
    ৽͍͠ઃఆɺσϑΥϧτͷมߋ
    w 7FSTJPO3FNPWFE
    ʜ
    ࡟আ͞Εͨόʔδϣϯ
    w 4BGF
    ʜ
    ِཅੑͳͲͳ͘ઃܭͲ͓Γʹ৴པͰ͖Δ
    w 4BGF"VUP$PSSFDU
    ʜ
    ࣗಈमਖ਼ͰյΕ͍ͯͳ͍ ͭͷϝλσʔλ
82. w 4BGF
    ΦϓγϣϯͷΈ࣮ߦ͢Δ
    w 4BGF"VUP$PSSFDU
    ͷΈ࣮ߦ͢Δ
    w σϑΥϧτͰ͸͢΂ͯ
    4BGF
    ѻ͍
    w ࠷৽όʔδϣϯͷ
    $PQ
    Λআ֎ͯ͠ ࣮ߦ͢Δ ࣮ߦΦϓγϣϯͷީิ
83. w 4BGF
    ͱ
    4BGF"VUP$PSSFDU
    ͷ൑ ఆʹ͍ͭͯͲ͏͢Δ͔
    w طଘΠγϡʔ͕͋Δ͔͕ͻͱͭͷࢦඪ ʹͳΓͦ͏
    ެ։͞Εͨ۩ମతඪຊ
    w ໰୊͕͋Ε͹
    3VCP$PQ
    $PSF
    ͔ 3VCP$PQ
    +1
    ·Ͱ͓ศΓΛ ݒ೦఺
84. w HPPE
    pSTU
    JTTVF
    ͱͯ͠ਐΜͰ ͍Δ ঢ়گ
85. SVCPDPQIRSVCPDPQ *OUSPEVDF
    OFX
    DPQT
    XJUI
    B
    TQFDJBM
    TUBUVT
    JOTUFBE
    PG
    FOBCMFEEJTBCMFE
87. w طଘͷ
    FOBCMFE
    
    EJTBCMFE
    ΁ ͷ֦ுͱղऍͰ͖Δ
    w ৽ͨʹ
    /FX
    ͋Δ͍͸
    OJM
    Λ༻ҙ ͯ͠ɺͦͷ஋ͷ৔߹͸৽ͨͳ
    $PQ
    Λ࢖͏͔Ϣʔβʔʹ༗ޮແޮΛΏ ͩͶΔܯࠂΛදࣔ͢Δ 5-%3
88. w ΞοϓάϨʔυ࣌ʹ໰୊ʹͳΔͷ͸ރ Ε͍ͯͳ͍৽͍͠
    $PQ
    ͷέʔε͕ଟ ͍
    ϦάϨογϣϯΑΓͪ͜Β͕ଟ͍
    w ϝλσʔλͷ
    7FSTJPO"EEFEɺ͋ Δ͍͸
    &OBCMFE
    ͷ
    /FX
    Λݩʹͯ͠ ࠷৽ͷόʔδϣϯͰ௥Ճ͞Εͨ
    $PQ
    Λআ֎͢Ε͹ޡݕ஌ΛݮΒͤͦ͏ *.0
    ΞοϓάϨʔυ΁ͷ҆৺ͷ޲্
89. w ݱঢ়ͷ
    3VCP$PQ
    Ͱແޮʹ͍ͨ͠ $PQ
    ͸
    Enabled: false
    ͱͯ͠ ରॲͰ͖Δ͕ɺԿ͔ͷҙਤ͕͋ͬͯ EJTBCMFE
    ʹͨ͠ͷ͔ɺόʔδϣ ϯΞοϓ࣌ͷރΕ͍ͯͳ͍
    $PQ
    ͩ ͔Βແޮʹ͍ͯ͠Δͷ͔ͷঢ়ଶ۠ผ ͕͔ͭͳ͍ ৽ͨͳϥϕϦϯά
90. SVCPDPQIRSVCPDPQ *NQMFNFOU
    PQUJPOT
    UP
    SVO
    POMZ
    TBGF
    DPQT
    BOE
    TBGF
    BVUPDPSSFDUT
92. w SVCPDPQ
    ίϚϯυ΁ͷΦϓγϣ ϯΛ௥Ճ͢Δ 5-%3
93. w --safe
    Φϓγϣϯ
    ʜ
    4BGF
    ͷ
    $PQ
    ͷΈ࣮ߦ͢Δ
    w --safe-auto-correct
    Φϓγϣϯ
    ʜ
    4BGF"VUP$PSSFDU
    ͷ
    $PQ
    ͷΈ࣮ߦ ͢Δ
    w ͜ΕΒΛ
    SVCPDPQZNM
    Ͱઃఆ΋Ͱ͖ ΔΑ͏ʹ͢Δ ৽ͨͳ࣮ߦΦϓγϣϯ
94. QPDLF *
    UIJOL
    UIBU
    UIPTF
    BSF
    UIF
    LFZ
    QPJOUT
    *
    EPO`U
    XBOU
    VT
    UP
    IBWF
    TPNF
    IVHF
    SPBENBQ
    GPS
    
    *
    XBOU
    VT
    UP
    IBWF
    TPNFUIJOH
    UIBU
    XF
    DBO
    BDUVBMMZ
    SFBDI
    JO
    B
    GFX
    NPOUIT IUUQTCMPHTJEFDJDPNJOUFSWJFXXJUICP[IJEBSCBUTPWCCGEB $BO
    ZPV
    UFMM
    VT
    UIF
    SPBENBQ
    PG
    3VCP$PQ
    
    JO
    NPSF
    EFUBJMT CCBUTPW *OUFSWJFX
    XJUI
    #P[IJEBS
    #BUTPW
    1SFTFOUFE
    CZ
    4JEFS
    5FBN
95. ͓ΘΓʹ
96. w 3BJMT
    ͱ
    1FSGPSNBODF
    ͸
    $PSF
    ͔ Β֎ΕΔ
    $PSF
    ͷϝϯςφϯεੑ
    w 3VCP$PQ
    
    ͸ϝλσʔλΛ࢖ͬͯ ҆৺͕͓͚ͦ͏ͳ
    $PQ
    ͱͦ͏Ͱͳ͍
    $PQ
    Λ৭෇͚Δ
    ར༻ऀ΁ͷ҆શੑ
    w ։ൃ͕͸͡·ͬͨ͹͔ΓͳͷͰ࠷৽ͷಈ ޲͸ϦϙδτϦΛݟ͍ͯͩ͘͞ ࠓޙͷ
    3VCP$PQ
97. wSVCPDPQIRSVCPDPQ
    wSVCPDPQIRSVCPDPQKQ
    wFTNJODBHJMF
    QSJWBUF
    wҙຯ͸Θ͔Γ·͢Ͷʁ 3VCP$PQ΁ͷJTTVF
98. One more thing…
99. 3BJMT044ύονձ
    ΄΅݄࣍։࠵
100. 4PDJBM
     DPEJOH
     TUBSUT
     XJUI
     ZPV :PV
101. !LPJD 5IBOLT
     .*/"48"/
102. IUUQTTQFBLFSEFDLDPNLBLVUBOJBHJMFNBOJGFTUPEFDBEF TMJEF !LBLVUBOJ