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コード改善ことはじめ
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Satoshi Honda
May 28, 2016
Programming
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5.6k
コード改善ことはじめ
Satoshi Honda
May 28, 2016
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Transcript
ίʔυվળ͜ͱ͡Ί @Satoshi Honda
ຊձΛ։͍ͨܦҢ
1)1ίʔυվળNFFUVQ
1)1ίʔυվળNFFUVQ
ίʔυվળNFFUVQ
ʮίʔυվળ͜ͱ͡Ίʯ
ٕज़తͳෛ࠴
w ΞʔΩςΫνϟ w σʔλϕʔε w %%% w ϚΠΫϩαʔϏε w ࣗಈԽ
w ςετ w Ϣχοτ w && w Πϯϑϥ w σϓϩΠ w ίʔσΟϯάϧʔϧͷ४ڌνΣοΫ w $* w ϫʔΫϑϩʔ w νϡʔχϯά w πʔϧ ෛ࠴ͷฦࡁखஈ
खஈ৭ʑ͋Γ·͚͢Ͳɺ Ͱ͖͍ͯͳ͍͔ͬͨ͜ͱ͕ଟʑ͋Γ·͢Ͷ
w ॳظɿ্ཱͪ͛ w ΤϯδχΞ͕࡞͍ͬͯͳ͍ w ίετΛ͑ΔͨΊʹ҆͘ w ʙதظɿظతͳऩӹ֫ಘʹΑΔࢪࡦ w རӹʹͳΔ͜ͱɺεϐʔυ༏ઌ
w ू٬ɾ࠾༻ͷࢿ w ֎෦ఏܞ w ΤϯδχΞҎ֎ͷ֤ઐྖҬͷ࠾༻ ৫ͱͯ͠ͷഎܠʢࠓ·Ͱͷܦݧ্ʣ
ظ த ظ λ ε Ϋ
ظ த ظ λ ε Ϋ w ίʔυվળ
w ϫʔΫϑϩʔվળ w ࣗಈԽ w ඪ४Խ w υΩϡϝϯτඋ
ظ த ظ λ ε Ϋ ͕࣌ؒऔΕͣෛ࠴͕ͨ·Γ͕ͪ ☓
w ίʔυվળ w ϫʔΫϑϩʔվળ w ࣗಈԽ w ඪ४Խ w υΩϡϝϯτඋ
৫Λͤ͞Δ্Ͱ ඞͣʁ௨Δಓ
৫ߏͷมԽ Ӧۀ Ϛʔέ اը ΤϯδχΞ ϓϩμΫτ
৫ߏͷมԽ Ӧۀ Ϛʔέ اը ΤϯδχΞ ϓϩμΫτ ަব͕͏·͍ ަবۤख
৫ߏͷมԽ Ӧۀ Ϛʔέ اը ΤϯδχΞ ͍ͭͷؒʹ͔τοϓμϯߏ ϓϩμΫτ
w ෦తͳ࠷దԽ w ຊདྷΔ͖λεΫޙճ͠ʢͪΓੵΕࢁͱͳ Δʣ w εϐʔυ༏ઌ w ಈ͔͢͜ͱ͕༏ઌɺ࣭ޙख w
طଘίʔυͷ࠶ར༻ w ϨϏϡʔΛऔΓೖΕ͍ͯΔ͚Ͳɺ࣭͕͕͋ͳΒ͍ w ࣭վળɺ͕࣌ؒͱΕͳ͍ܧଓ͠ͳ͍ ׳Εຊʹා͍
ٕज़Λثʹ w αʔϏεͷ҆ఆՔಇ w վળͷ1%$"αΠΫϧΛߴԽͤ͞Δ w ϏδωεͷมԽʹॊೈʹରԠͤ͞Δ ΤϯδχΞͷׂ
Ϣʔβܧଓͯ͠ՁΛఏڙ͠ɺରՁΛಘΔ Ϗδωεͱͯ͠ͷվળ
୭ͷͰͳ͘ ৫ʢਓʣ͕͢Δաఔ Ͱىͬͨ͜ɺ৫Ͱͷෛ࠴
w ௐࠪɾόάͷൃੜ͕͕͍͋ͬͯΔ w ରԠ࿙Εͷൃੜ͕͕͍͋ͬͯΔ 㱺मਖ਼ʹΑΔӨڹൣғେ w ֦ு͕ࠔͰɺमਖ਼͕͕͍͋ͬͯΔ w ίϛϡχέʔγϣϯίετ͕͕͍͋ͬͯΔ w
උ͞Εͳ͍υΩϡϝϯτɺଐਓత࡞ۀ τϨʔχϯάίετ͕͍͋ͬͯΔ ͱ͍͑
࣌ۚͳΓ 5JNFJT.POFZ
Ϣʔβܧଓͯ͠ՁΛఏڙ͠ɺରՁΛಘΔ Ϗδωεͱͯ͠ͷվળ ☓ ຊస
w ίʔυվળ w ϫʔΫϑϩʔվળ w ৽ٕज़ͷಋೖ w ඪ४Խ w υΩϡϝϯτඋ
ظ த ظ λ ε Ϋ ෛ࠴ى͖Δલఏ͚ͩͲ
63-ɿIUUQCMPHNBEPSPPSHNO
63-ɿIUUQTTQFBLFSEFDLDPNOBPZBLBJGB[V[IJGBMTFNBOF[JNFOUP
ʮίʔυվળ͜ͱ͡Ίʯ
՝ೝࣝͷڞ༗ ΦʔϓϯԽ
ʮ͓લ୭ͩΑʯ
w ϑΣΠεɾτΡɾϑΣΠε w ҿΈɾϥϯν w ։ൃ.UH w ίʔυ w ϨϏϡʔ
w ػೳՃɾόάमਖ਼ w ՝ͷใΛΦʔϓϯԽ w ใ w JTTVFͷ׆༻ ίϛϡχέʔγϣϯͷػձΛ૿͢
༏ઌҧ͑Ͳ ͳΜͱ͔͠ͳ͍͚ͯ͘ͳ͍ ˣ ՝ͷೝࣝօಉ͡
ٕज़ͷඪ४Խ
None
֤ηϯςϯεΛςʔϚʹɺϓϩμΫτίʔυ͔Β ಡΈ͍͢ͱײͨ͡ίʔυ ಡΈʹ͍͘ͱײͨ͡ίʔυ ٙ ؾ͓͚͍ͨ͜ͱʢ࣮ફ͍ͨ͜͠ͱʣ Λ·ͱΊͯσΟεΧογϣϯ͢Δձ
༻ޠXJLJ ϑϨʔϜϫʔΫͷऔΓܾΊ ෭࣍తޮՌ
'BDFUP'BDFͷίϛϡχέʔγϣϯ ·ͩ·ͩΓ͍ͯͳ͍
۩ମతʹͨ͠ࢲ͔ΒͷΞΫγϣϯ ·ͩ͜͜·ͰͳΜͰ͕͢ʜ
࣮ΛऔΔΈʢՄࢹԽʣ ࣗൃతͳϝϯόͷΞΫγϣϯ
վળͷ͕ग़དྷͨʂ
୭ͷͰͳ͘ ৫ʢਓʣ͕͢Δաఔ Ͱىͬͨ͜ɺ৫Ͱͷෛ࠴
ࣗൃతͳΞΫγϣϯ ·ͣखΛ্͛Δ
࣮ݱ͍ͯ͠Δͱ͍͏͜ͱ ৫ͱͯ͠ͷڞ௨ೝࣝͰ͋Δ
Ϣʔβܧଓͯ͠ՁΛఏڙ͠ɺରՁΛಘΔ Ϗδωεͱͯ͠ͷվળ
ίʔυվળNFFUVQ ίʔυͷ͢Δͧ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ