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ESLintとCyclomatic complexityの話
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Kenya Hoshi
July 13, 2019
Programming
0
950
ESLintとCyclomatic complexityの話
ESLintを使って、JavaScriptのコード内でCyclomatic complexity(循環的複雑度)が高い箇所を特定するお話です。
Kenya Hoshi
July 13, 2019
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Transcript
&4-JOUͱ $ZDMPNBUJDDPNQMFYJUZͷ !ZBIPPTIJLFO 4VTUBJOBCMF'SPOUFOE
ࣗݾհ w ໂᜌ݈)PTIJNVSF,FOZB w !ZBIPPTIJLFO w পߴઐˠେࡕେֶجૅֶ෦ٳֶத w גࣜձࣾ10-ΤϯδχΞ w
Likes:8FC'SPOUFOE 3FBDU 5ZQF4DSJQU &MN )3 4BB4 .BOBHFNFOU
ʮྑ͍ʯίʔυͱʁ ಥવͰ͕͢ʜ
8IBU`Tl$MFBO$PEFz ࢲɺࣗͷίʔυ͕ΤϨΨϯτͰޮྑ͍͜ͱΛΈ·͢ɻ ϩδοΫόά͕ೖΓࠐΈʹ͍͘Α͏ʹ୯७Ͱ͋Δ͖Ͱɺ ґଘੑอक͕༻ҙͱͳΔΑ͏ʹ࠷খݶʹ͖͢Ͱ͋Γɺ ΤϥʔॲཧҰ࿈ͷઓུʹଇͬͯશͰͳ͚ΕͳΒͣɺ ޙʑɺଞͷਓ͕ཧʹཪଧͪ͞Ε͍ͯͳ͍࠷దԽΛߦ͏ ༠ʹ͔ΒΕͯɺίʔυ͕͙ͪΌ͙ͪΌʹͳͬͯ͠·Θͳ͍Α͏ɺ ࣮ߦޮ࠷ߴʹ͍ۙͷͰͳ͚ΕͳΓ·ͤΜɻ ΫϦʔϯίʔυͱͭͷ͜ͱΛ্ख͘Δ͜ͱͰ͢ɻ #KBSOF4USPVTUSVQ
։ൃऀʹͱͬͯʮྑ͍ʯίʔυ Մಡੑ͕ߴ͍ʢSFBEBCMFʣ อकੑ͕ߴ͍ʢNBJOUBJOBCMFʣ ϘΫ͕ࢥ͏
ͦΜͳ؆୯ʹʮྑ͍ʯίʔυ ॻ͚ͳ͍ ͱ͍͑ɺ
ͳ͔ͥʁ
None
͜͜Ͱڥ൜ࡑֶͷΛ ࣏͕҆ѱԽ͢Δ·Ͱʹ࣍ͷܦաΛͨͲΔɻ ݐͷ૭͕յΕ͍ͯΔͷΛ์ஔ͢ΔͱɺͦΕ͕ʮ୭֘۠ʹ ରؔ͠৺Λ͍ͬͯͳ͍ʯͱ͍͏αΠϯͱͳΓɺ൜ࡑΛى͜͢͠ ͍ڥΛ࡞Γग़͢ɻ ΰϛͷϙΠࣺͯͳͲͷܰ൜ࡑ͕ى͖Δɻ ॅຽͷϞϥϧ͕Լͯ͠ɺҬͷৼڵɺ҆શ֬อʹڠྗ͠ͳ͘ͳ ΔɻͦΕ͕͞ΒʹڥΛѱԽͤ͞Δɻ ڟѱ൜ࡑΛؚΊͨ൜ࡑ͕ଟൃ͢ΔΑ͏ʹͳΔɻ
ιϑτΣΞ։ൃͷݱͰ ࣅͨΑ͏ͳޫܠ͋Γ·ͤΜ͔ʁ
#SPLFO8JOEPX5IFPSZ ࣏҆Λճ෮ͤ͞Δʹ ɾҰݟແͰ͋ͬͨΓɺܰඍͳடংҧߦҝͰऔΓక·Δ ʢ͝Έ͖ͪΜͱผࣺͯͯ͠ΔͳͲʣ ɾܯ৬һʹΑΔύτϩʔϧަ௨ҧͷऔΓక·ΓΛڧԽ͢Δ ɾҬࣾձܯ৬һʹڠྗ͠ɺடংͷҡ࣋ʹྗ͢Δ
ׂΕͨ૭Λ์ஔ͓͔ͯ͠ͳ͍ #PZ4DPVU3VMF ɾѱ͍ઃܭɺؒҧͬͨҙࢥܾఆɺ࣭ͷѱ͍ίʔ υɺൃݟͱಉ࣌ʹશͯम෮͢Δ ɾ͠ਖ਼͘͠म෮͢Δ͚ͩͷ͕࣌ؒͳ͚Ε ɺͦͷࢫΛΘ͔Γ͘͢ίϝϯτͳͲͰ໌ ࣔ͢Δ
-FBWFUIJTXPSMEBMJUUMF CFUUFSUIBOZPVGPVOEJU ͕ࣗ࠷ॳʹݟͨ࣌ΑΓɺੈքΛ͍͍ॴʹ͘͢ྗ͠Α͏ 3PCFSU#BEFO1PXFMM
Ͳ͏ͬͯιʔείʔυͷ Λૣظൃݟ͢Δ͔ʁ ͡Ό͋ɺ
ͦ͜Ͱ
&4-JOUΛ͏ϝϦοτ ຊ࣭తͰͳ͍ϨϏϡʔ͕ݮΔ ੩తղੳʹΑΔෆ۩߹ͷൃݟ
&4-JOUΛ͏ϝϦοτ ຊ࣭తͰͳ͍ϨϏϡʔ͕ݮΔ ੩తղੳʹΑΔෆ۩߹ͷൃݟ
ຊ࣭తͰͳ͍ϨϏϡʔ const person = { name: “Steve Jobs”, age: 45
}; ɾ0CKFDUͷ࠷ޙͷϓϩύςΟʹίϯϚ͚ͭͯཉ ͍͠ͳɻHJUͷ͕ࠩΑΓΘ͔Γ͍͔͢ΒͶɻ ɾϘΫμϒϧΫΥʔτΑΓγϯάϧΫΥʔτͷ ํ͕͖ͳΜͩɻ4IJGUΛԡͣ͞ʹೖྗͰ͖Δ͔Β Ͷɻ
ୀ۶ͳ͜ͱ&4-JOUʹΒͤΑ͏ ɾਓ͕ؒϓϩάϥϜͷॻ͖ํͷҧ ͍Λࢦఠ͢Δ͜ͱɺ݂Ͱ݂Λચ ͏ऴΘΓͷͳ͍૪͍ΛੜΈग़͢ ɾਓؒؔͷѱԽΛڪΕͯɺࢦఠ Λ͠ͳ͍ͷιϑτΣΞͷʮׂ Εͨ૭ʯΛ์ஔ͢Δ͜ͱ ɾຊདྷɺਓ͕ؒΔ͖αʔϏε ϩδοΫ༷ͷϨϏϡʔʹूத ͠Α͏
&4-JOUΛ͏ϝϦοτ ຊ࣭తͰͳ͍ϨϏϡʔ͕ݮΔ ੩తղੳʹΑΔෆ۩߹ͷൃݟ
੩తղੳͱʁ ίʔυΛ࣮ߦͤͣʹߦ͏ݕূ ɾίʔυͷՄಡੑʹؔ͢Δ ɹɹΠϯσϯτͳͲͷॻࣜҧ ɹɹ໋໊نҧ ɾίʔυͷෳࡶ͞ͳͲʹؔ͢Δݕূ ɹɹΫϥεɺϝιουͷॲཧͷෳࡶ͞ ɹɹΫϥεؒͷґଘؔ
ࠓͷຊ ͬͱ
$ZDMPNBUJDDPNQMFYJUZ ॥తෳࡶ
ʮ॥తෳࡶʯͱʁʁʁ ɾ5IPNBT.D$BCF͕։ൃͨ͠ ιϑτΣΞଌఆ๏ͷҰछ ɾϓϩάϥϜͷ੍ޚϑϩʔΛάϥϑͱͯ͠ දݱ͠ɺܭࢉ͞ΕΔɻ ɾJG FMTF GPS TXJUDI͕ଟ͍ذύλʔϯ ͕ଟ͍΄Ͳෳࡶ͕ߴ͍
ɾ॥తෳࡶ͕ߴ͍΄Ͳɺόάͷࠞೖ͕ ߴ͍ͱݴΘΕ͍ͯΔɻ
&4-JOUͰ $ZDMPNBUJDDPNQMFYJUZ { "complexity": ["error", 10] } Λɺ͋ͳͨͷFTMJOUSDʹՃ͢Δ͚ͩʂ؆୯ʂ
ෳࡶΛଌΔπʔϧͰ ͜Μͳͷ͋Γ·ͨ͠ ͦͷଞʹ
FTBOBMZTJTQMBUP +BWB4DSJQUͷίʔυΛղੳͯ͠ɺίʔυߦ ෳࡶεςοϓͳͲΛՄࢹԽͯ͘͠ΕΔ OQNύοέʔδ IUUQTXXXOQNKTDPNQBDLBHFQMBUP
࣮ࡍͷγεςϜͰݕূͯ͠Έͨ
ࠓճͷݕূରγεςϜ ɾ݄pSTUDPNNJUͷ3FBDUϓϩδΣΫτ ɾॳظϑϩϯτΤϯυઐΤϯδχΞਓ ɾۀҕୗͱΠϯλʔϯੜͷͱྦͷ݁থ ɾνʔϜϝϯόʔʮෛ࠴ͦ͏ʜʯ
QMBUPͰͷݕূ݁Ռ ສߦʂ ͼͬ͘Γʂ ͓ʁ ҙ֎ͱେৎʁ
&4-JOUͰͷݕূ݁Ռ ສߦͷதͰFSSPSʂࢥͬͯΑΓগͳ͍ʜ☺
॥తෳࡶͱόάࠞೖͷؔ ࢀߟɿIUUQTXXXJOGPRDPNOFXTDZDMPNBUJDDPNQMFYJUZ ॥తෳࡶ όάࠞೖ֬
·ͱΊ ɾϦϑΝΫλϦϯάΛͲ͔͜ΒखΛ͚Δ͔ͷ ํΛܾΊΔஅࡐྉ͕ू·ͬͨʂ ɹϦϑΝΫλલޙͰ͕Ͳ͏ͳΔָ͔͠Έ ɾνʔϜϝϯόʔͷίʔυʹରͯ͠ͷةػҙࣝ ͕ߴ·ͬͨ ɹΞʔΩςΫνϟ৽ϓϩδΣΫτ࢝ಈʂ
5IBOLT