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Tomoki Ota ʲGOݴޠʳจࣈྻ
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ΞδΣϯμ ᶃจࣈྻͱʁ ᶄจࣈηοτͱʁ ᶅΤϯίʔσΟϯάͱʁ ᶆίʔυϙΠϯτͱʁ ᶇruneͱʁ ᶈจࣈ ᶉTrimؔ ᶊจࣈྻͷߏ ᶋจࣈྻ v.s. όΠτ ᶌจࣈྻͷෆมੑ ᶍ෦จࣈྻ
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จࣈྻͱʁ
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ΠϛϡʔλϒϧͳόΠτྻͷϙΠϯλ ͦͷόΠτྻͷόΠτͷ૯ จࣈྻͱʁ Goͷจࣈྻ͜ΕΒΛอ࣋͢ΔΠϛϡʔλϒϧͳσʔλߏ
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จࣈηοτͱʁ
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จࣈηοτͱʁ จࣈͷू߹
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จࣈηοτͱʁ Unicodeͷจࣈηοτ → ݸͷจࣈ͕͋Δ 221
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ΤϯίʔσΟϯάͱʁ
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ΤϯίʔσΟϯάͱʁ จࣈͷϦετΛ2ਐͰ༁ͨ͠ͷ
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ΤϯίʔσΟϯάͱʁ UTF-8 : શͯͷUnicodeจࣈΛՄมͳόΠτ(1ʙ4όΠτ)Ͱ ΤϯίʔσΟϯάͰ͖ΔΤϯίʔσΟϯάن֨
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ίʔυϙΠϯτͱʁ
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ίʔυϙΠϯτͱʁ நจࣈΛදݱ͢ΔͨΊʹ ׂΓͯΒΕͨ൪߸ͷ͜ͱɻ ූ߸Ґஔɺූ߸ͱݺΕΔ
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ίʔυϙΠϯτͱʁ ͋ΒΏΔจࣈʹׂΓৼΒΕͨ൪߸
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ίʔυϙΠϯτͱʁ UnicodeίʔυϙΠϯτͷू߹ମ
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ίʔυϙΠϯτͷྫ
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ίʔυϙΠϯτͷྫ U+8089 Unicode
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ίʔυϙΠϯτͷྫ 0xE8, 0x82, 0x89 UTF-8
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runeͱʁ
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runeͱʁ UnicodeͷίʔυϙΠϯτ
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runeͱʁ UnicodeͷίʔυϙΠϯτ : 21Ϗοτ
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runeͱʁ int32ͷΤΠϦΞε
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runeͱʁ
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จࣈྻ
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จࣈྻϦςϥϧ GoͷจࣈྻৗʹUTF-8Ͱͳ͍
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จࣈྻϦςϥϧ
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จࣈྻϦςϥϧ GoͷιʔείʔυɺશͯUTF-8ͰΤϯίʔυ͞ΕΔ
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จࣈྻϦςϥϧ จࣈྻࣗମҙͷόΠτྻͰ͋Γɺඞͣ͠UTF-8Ͱ͋ΔΘ͚Ͱͳ͍ɻ ϑΝΠϧ͔ΒಡΈࠐΉ : จࣈϦςϥϧͰॳظԽ͞Ε͍ͯͳ͍
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จࣈྻϦςϥϧ golang.org/x : ඪ४ϥΠϒϥϦʹର͢Δ֦ுΛఏڙ͢ΔϦϙδτϦ UTF-16ͱUTF-32Λѻ͏ͨͷύοέʔδΛؚΉ
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จࣈྻϦςϥϧ 1จࣈৗʹ1όΠτʹΤϯίʔυ͞ΕΔΘ͚Ͱͳ͍
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จࣈྻϦςϥϧ
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จࣈྻϦςϥϧ 0xE8, 0x82, 0x89
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จࣈྻϦςϥϧ
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จࣈྻϦςϥϧ
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จࣈྻϦςϥϧ ಛघจࣈêΛUTF-8ʹΤϯίʔυ͢Δͱ c3 aaʹͳΔ ͪͳΈʹɺc3Ã
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จࣈྻΛεϥΠεʹ͢Δํ๏
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จࣈྻΛεϥΠεʹ͢Δํ๏
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จࣈྻΛεϥΠεʹ͢Δํ๏ ࣮ߦ࣌ͷΦʔόʔϔου͕ൃੜ͢Δɻ จࣈྻΛruneͷεϥΠεʹม͢ΔʹɺՃͷεϥΠε ΛׂΓͯɺbyteΛruneʹม͠ͳ͚ΕͳΒͳ͍ɻ ࣌ؒܭࢉྔO(n) → Ͱ͖ΔݶΓ࠷ॳͷղܾ๏Ͱߦ͏ํ͕ྑ͍ɻ
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จࣈྻʹindexͰΞΫηε͢Δ
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Trimؔ
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Trimؔͱʁ stringsύοέʔδͷTrimLeftɺTrimPre f ixͳͲͷ TrimXXXͱͳΔؔͷ͜ͱɻ
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TrimRight ඌͷจࣈ͕ɺୈೋҾʹࢦఆͨ͠runeͷू߹ʹ ͯ·ͬͨΒɺͦͷจࣈΛআ͢Δ
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TrimRight
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༩͑ΒΕͨඌࣙͷจࣈྻΛ ඌ͔ΒऔΓআ͍ͨΛฦ͢ TrimSuf f ix
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TrimSuf f ix
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TrimLeft
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TrimPre f ix
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Trim
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TrimFunc
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TrimLeftFunc
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TrimRightFunc
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TrimSpace
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จࣈྻͷ࿈݁
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γϯϓϧͳ࿈݁(+=Ͱ࿈݁͢Δ)
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γϯϓϧͳ࿈݁(+=Ͱ࿈݁͢Δ)
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strings.BuilderΛ༻͢Δํ๏(ࣄ લׂΓͯͳ͠)
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strings.BuilderΛ༻͢Δํ๏(ࣄલׂΓͯͳ͠)
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strings.BuilderΛ༻͢Δํ๏(ࣄ લׂΓͯ͋Γ)
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strings.BuilderΛ༻͢Δํ๏(ࣄલׂΓͯ͋Γ)
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݁ہͲΕ͕͍͍ͷ͔
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ϕϯνϚʔΫςετͰɺ̏ͭͷํ๏͕Ұ൪͍ 2,3ݸͷจࣈྻΛ࿈݁ˠγϯϓϧͳ࿈݁ 5ݸҎ্ͷ࿈݁ˠ strings.Builder
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จࣈྻ v.s. όΠτ
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GOͰ΄ͱΜͲͷI/Oɺจ ࣈྻͰͳ͘ɺόΠτΛ͏
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จࣈྻ v.s. όΠτ
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จࣈྻ v.s. όΠτ
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จࣈྻ v.s. όΠτ
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จࣈྻͷෆมੑ
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จࣈྻΠϛϡʔλϒϧ
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จࣈྻͷෆมੑ
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෦จࣈྻ
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จࣈྻΠϛϡʔλϒϧ
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෦จࣈྻ
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෦จࣈྻ
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෦จࣈྻ
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෦จࣈྻ ϩάϝοηʔδΛจࣈྻͱͯ͠ड͚ औΔɻ࠷৽ͷnݸͷUUIDͷΩϟο γϡΛอଘ͢ΔɻϝϞϦʹอଘ͢Δ ϩά࠷ॳʹ36จࣈͷUUIDͰ ϑΥʔϚοτ͞Εͯɺͦͷޙʹϝο ηʔδ͕ࣗଓ͘ɻ
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෦จࣈྻ UUIDΛऔΓग़͢ࡍʹlog[:36]Ͱ෦ จࣈྻԋࢉΛ༻͍ͯ͠Δ
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෦จࣈྻ UUIDΛऔΓग़͢ࡍʹlog[:36]Ͱ෦ จࣈྻԋࢉΛ༻͍ͯ͠Δ log[:36]ಉ͡جఈྻΛࢀর͢Δ จࣈྻΛ৽ن࡞͢ΔͷͰɺϝϞϦ ʹ֨ೲ͞ΕΔuuid36byte͚ͩͰ ͳ͘ɺݩͷϩάจࣈྻͷόΠτʹ ͳΔ
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ղܾࡦ1 ෦จࣈྻΛ[]byteʹม͠ɺจࣈྻʹม͢Δ
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ղܾࡦ2 strings.CloneΛ͏(v1.18Ҏ্)
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෦จࣈྻͰɺεϥΠεͷൣғόΠτʹج͍͓ͮͯΓɺruneͷͰͳ͍ ෦จࣈྻಉ͡جఈྻΛڞ༗͢ΔͷͰɺϝϞϦϦʔΫʹͳΔՄೳੑ͕͋Δ ϝϞϦϦʔΫstrings.Clone()͔จࣈྻͷมʹΑͬͯίϐʔΛߦ͏͜ͱͰղܾ ͢Δ ·ͱΊ