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RuboCop Philosophy
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Koichi ITO
February 25, 2023
Programming
2
2.1k
RuboCop Philosophy
プログラミング言語Ruby 30周年イベント ライトニングトーク
https://30.ruby.or.jp/
Koichi ITO
February 25, 2023
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Transcript
3VCP$PQϝϯςφʔ͙͠͞ RuboCop Philosophy ϓϩάϥϛϯάݴޠ3VCZपه೦Πϕϯτ 4BU ҏ౻ߒҰ&4. *OD
େࣄͳ͜ͱ ࠷ॳʹ
ॕप🎉
@koic w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜ wגࣜձࣾӬγεςϜϚωδϝϯτ &4. *OD ΤϯδχΞϦϯάϚωʔδϟʔ݉ σΟεςΟϯάΠογϡυΤϯδχΞ
None
044ίϛϡχςΟͱͷڞੜΛࢧԉ 3BJMT044ύονձ #esm_oss
None
w +BWB4DSJQU1SFUUJFS &4-JOU w (P(PGNU w 3VTU3VTUGNU $MJQQZ w 3VCZ3VCP$PQ
4UBOEBSE BOE PUIFST ϦϯλʔϑΥʔϚολʔͷੈք
None
.F
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTEPZPVMPWF
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU
None
ࠓͷ
3VCP$PQDPSFEFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 ։ൃऀʹΑͬͯߟ͑Έͷҧ͍͕͋Δ ͳͷͰ͜ͷൃදࢲݸਓͷݟղͰ͢
None
࣍ ੜͱֶ ϐϥϛουͱࣗಈԽ ϝϯςφʔ͙͠͞
ੜͱֶ
w 3VCZ݄ੜ·Ε w IUUQTCMBEFSVCZMBOHPSHSVCZMJTU w 3BJMT݄ʹΞφϯε w IUUQTCMBEFSVCZMBOHPSHSVCZUBML w 3VCP$PQ݄ʹTUίϛοτ
w IUUQTHJUIVCDPNSVCPDPQSVCPDPQDPNNJUBGCFBE 3VCZ 3BJMT 3VCP$PQͷੜ
w 3VCZप w ॊೈͳදݱྗΛඋ͑ͯɺϓϩάϥϛϯάΛ ָ͘͢͠Δ 3VCZJTUʹͤΛ͜Ϳ ݴޠ w 3VCP$PQࡢप w
3VCZͱ͓Αͦࡀࠩ 3VCZͱ3VCP$PQ
Λ౿·͑ͨެֶࣜ IUUQTEPDTSVCPDPQPSHSVCPDPQJOEFYIUNMQIJMPTPQIZ
w 3VCP$PQ3VCZ4UZMF(VJEFͷϥϯλΠϜ࣮ w ॳظʹࢦͨ͠ͷHPGNUతͳେ౷ҰϑΥϚολʔ w 3VCZίϛϡχςΟʹڝ߹͢ΔελΠϧΈ͕͋Δ͜ ͱʹؾͮ͘ FHμϒϧΫΥʔτɺγϯάϧΫΥʔτ w
ҰൠతͳελΠϧΛߏՄೳʹ͢ΔΑ͏ʹͳΔ w ελΠϧΨΠυΛσϑΥϧτͱͭͭ͠ɺΈͷҧ͍Λड ͚ೖΕΔͱ͍͏ֶʹجͮ͘Α͏ʹͳΔ 3VCP$PQͷֶαϚϦʔ
Έͷҧ͍Λड͚ ೖΕΔͱ͍͏ֶ
ϐϥϛουͱࣗಈԽ
3VCZίϛϡχςΟͱ ίʔσΟϯάελΠϧ
ੜͷϢʔβʔ ϕςϥϯ͔Β ϏΪφʔ·Ͱ෯͍
ࢲ ͨͪ ͷߟ͑ͨ ࠷ڧ͋Δ͍࠷Ѫͷ ελΠϧଟ
ڷʹೖΕ ڷʹै͑ ίʔσΟϯάελΠϧʹݴ͑Δ͜ͱ
ಛʹࣄͰେਓ ʹͳΔඞཁ͕͋Δ
ϓϩδΣΫτ ࣄ ελΠϧϐϥϛου ݖҖͷελΠϧΨΠυ ࣗͷελΠϧ ϓϩδΣΫτͷελΠϧ͕͓͔͔ͬͨ͠ΒԼࠀ্͕ى͖͏Δ ͋͑ͯϧʔϧΛઃ͚ͳ͍PSߟྀ͞Εͣ Ѫ ܟҙ कഁ
PSແ ϑϦʔμϜ δϟεςΟε ϓϩδΣΫτϧʔϧ༏ઌͰ ϧʔϧ͕ͳ͚Ε ϑΥʔϧόοΫ͞Ε͍ͯ͘ $IBPT -BX
͞Γ͞Γͱͯ1SPCMFNWT64 IUUQTUXJUUFSDPNPOLTUBUVT
None
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTEPZPVMPWF
IUUQTSBJMTIPTUJOHDPNXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU
σϑΥϧτ͕͍ ͮΒ͍͕ߏ͢Δ ͷ໘ͱ͍͏
w σϑΥϧτ͕ݫ͗͢͠Δ w ݫ͍͠కΊ͚͕ྑ͍ͱ͍͏͋Δ w σϑΥϧτͰબ͞ΕͨελΠϧ͕͋Θͳ͍ w ରۃ͕࣠͋Δͷ͍͠ɻྫ͑γϯάϧΫΥʔτͱμϒϧ ΫΥʔτͷ߅૪ऴΘΒͳ͍ɻ3VCZ͕͖ͳͷΘ͔ͬͨɻ w
σϑΥϧτͰ༗ޮͷϧʔϧ͕ଟ͗͢Δ w ͜Εͦ͏ɻؤுͬͯݮΒ͢׆ಈΛ͍ͯ͠Δ͕ɺ͍ͨΜɻ σϑΥϧτͷݱ࣮ͷ
͍ͪͲσϑΥϧτʹ ͳͬͨͷखڧ͍
None
ϝϯςφʔ͙͠͞
."/"48"/ ͷෛ୲ΛݮΒ͢ ඞཁҎ্ͷΧελϚΠζઃఆ
w ཧͱ͢ΔσϑΥϧτ5IF3BJMT%PDUSJOF ͷʮ5IFNFOVJTPNBLBTFʯͷੈք؍ w ͍͍ͩͨͷ߹σϑΥϧτͰ͏·͍͘͘ w ͨ·ʹ ͋Θͳ͍෦ΧελϚΠζͰ͖Δ શͯԕ͖ཧڷ
Ͳ͏͍͏ߟ͑ํʹ ࢲج͍ͮͯΔʁ
w ίϯτϦϏϡʔλͷ Ϛʔδͷ ຬײ Ͱͳ͘ɺϓϩμΫτͷϢʔβʔͷ͍উ खΛॏࢹ͢Δ w ͨͱ͑ಛఆͷϓϩδΣΫτͷΈ͕σϑΥ ϧτ͖ͱݶΒͳ͍ $PQDPQͱ͍͏ϝλ׆ಈ🚨
Ϋϩʔζ৺ॏ͍Ͱ͕͢Ϣʔβʔͷ൵໐Λ͙ͷΛ༏ઌ
ਓدΓʁࢻਓدΓʁ ਓ ࢻਓ w νʔϜ։ൃ w ݎ͍ن w ౷Ұੑͷ९क w
ݸਓ։ൃ w ؇͍ن w ଟ༷ͷड͚ೖΕ ߹͍
ࢲࣗͷࣗݾੳ ਓ ࢻਓ w νʔϜ։ൃ w ݎ͍ن w ౷Ұੑͷ९क w
ݸਓ։ൃ w ؇͍ن w ଟ༷ͷड͚ೖΕ ߹͍
ࢲͷֶ ਓ ࢻਓ w ͬͱࣗ༝͕͋Δͱࣗવຯ ָ͠͞ ͋Δ w σϑΥϧτϧʔϧͬͱ؇ͯ͘ྑ͍ w
ʮݫ͗͢͠ͳʯϧʔϧͷఏҊ͓فΓ͢Δ ߹͍
w ϧʔϧͱͯ͠ݫ͗͢͠Δ w ಠࣗϧʔϧײ͕ڧ͍ w ِཅੑ͕ଟ͍͜ͱ͕ࣗ໌ͳͷ w ϚʔδޙʹϢʔβʔͷ൵໐͕େ͖ͦ͏ͳͷ ίΞʹड͚ೖΕʹ͍͘ϧʔϧ ίΞͰͳ͘SEύʔςΟʔͰͷެ։ΛΊ͍ͯΔ
େ౷ҰͰ͖Δ͔ ਓ ࢻਓ w ελΠϧͰΈ͕͔ΕΔ w ਓࢻਓͷ߹͍͕։ൃऀ͝ͱʹҟͳΔ w ͳΜͳΒ3VCZίϛολʔͰҟͳ͍ͬͯͨ ߹͍
3VCP$PQDPSFEFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 ։ൃऀʹΑΔߟ͑Έͷҧ͍Λௐఀ͢Δ 3VCZJTUͷ͚ͩελΠϧͷΈ͕ੜ·ΕΔ
None
" ࠷ߴͷ$PQΛٻΊͯ
w ϓϩάϥϚʔͷϝϞϦཧ͔ॲཧܥͷ($ͷ Ͱͳ͘ɺίϯύΠϥͰϝϞϦཧΛղܾ ͢Δ3VTUͷಓ w ੩తܕ͚ͷܕԸܙ͔ಈతܕ͚ͷखܰ͞ͷ Ͱͳ͘ɺܕఆٛϑΝΠϧͰ྆औΓΛࢦ ͢3#4ͷಓ ୈࡾͷղܾ
w HPGNUͷΑ͏ͳҰϑΥʔϚοτͱϢʔβʔ ΧελϜͷߏͷͰͳ͘ɺͳΜͱͳ͘ ೲಘײͷ͋Δʮ͍͍ͩͨ͏·͍͘͘ߏʯ w 3VCP$PQͰݕ౼͞ΕͯΔϓϦηοτ͕ͦΕ ʹ͍͕ۙʮ୭͔ͷዞҙੑʯ͔Βൈ͚ग़ͤͳ͍ 3VCP$PQͰୈࡾͷղܾ
Ѫ͋Δዞҙੑ͕ ղܾͷಓʁ
w ίϛϡχςΟͷҙࢥܾఆͱผʹ༏͍͠ಠࡋऀͷΑ ͏ͳݸਓʹΑΔҙࢥܾఆϞσϧ w ੨ๆ͞Μͷʮ3VCZͷίʔσΟϯάελΠϧʯ w લాमޗ͞Μͷʮ3VCZίʔσΟϯάنʯ w ۩ମతͳʮಛఆͷ୭͔ʯॏཁͰʁ FH0OL$PQ
ଥͦ͏ͳʮ୭͔ʯϧʔϧʁ
w ͍͍ͩͨ͏·͍͖ͦ͘͏ʁ .BU[$PQ
w ·ͭͱ͞Μम w 3VCZͷͱ͍͏͜ͱѪੈքҰ w DisabledByDefault: trueϕʔεͷ֦ுHFN
w ϧʔϧ $PQ ແݶʹ૿͍͍͑ͯͬͯΔͷͰɺ ϛχϚϜͷελʔλʔΩοτΑ͏ͳͷʹͳΓ ͦ͏ .BU[$PQͷ͝ఏҊ
w େਓʹͳͬͨ3VCZΛݟकΔ.BU[$PQͷΑ͏ͳݖ ҖͷσϑΥϧτ͕͋Δͱͤͳ3VCZJTU͍ͦ͏ w ͱ͍͑ϧʔϧͷऔࣺબ͕͍ͨΜͦ͏ w 3VCP$PQϓϩμΫτͱͯ͠αϙʔτελΠϧ ͷͻͱͭͱݟ၏͠3VCP$PQͷֶΛຬͤ͞Β ΕΔ पͷઌʹ͚ۭͨ
ͦΕͧΕͷՖ͋Γ ָͯͦ͜͠💐
ॕप🎉