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【Go言語】値の比較

Avatar for Tomoki Ota Tomoki Ota
August 15, 2024
Programming
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33

 【Go言語】値の比較

値の比較について解説しています
Avatar for Tomoki Ota

Tomoki Ota

August 15, 2024
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Transcript

  1. Tomoki Ota ʲGoݴޠʳ஋ͷൺֱ

  2. ஋ͷൺֱ͸ৗʹ==Λ࢖ͬͯ ൺֱͰ͖ΔΘ͚Ͱ͸ͳ͍

  3. ൺֱͰ͖Δྫ ൺֱͰ͖ͳ͍ྫ ൺֱՄೳͳΦϖϥϯυ ൺֱෆՄೳͳܕͷൺֱ ΞδΣϯμ 3

  4. ൺֱͰ͖Δྫ

  5. ൺֱͰ͖Δྫ 5

  6. ൺֱͰ͖ͳ͍ྫ

  7. ൺֱͰ͖ͳ͍ྫ 7

  8. ൺֱՄೳͳΦϖϥϯυ

  9. ൺֱՄೳͳΦϖϥϯυ 9 == ͱ !=͸ɺΦϖϥϯυ͕ൺֱՄೳ(comparable)ͷͱ͖ʹ࢖༻Ͱ͖Δ

  10. ൺֱՄೳͳΦϖϥϯυ 10 boolean ਺஋(੔਺ܕɺුಈখ਺ܕɺෳૉ਺ܕ) จࣈྻ νϟωϧ ΠϯλʔϑΣΠε ϙΠϯλ ߏ଄ମͱ഑ྻ

  11. ൺֱՄೳͳΦϖϥϯυ 11

  12. ൺֱՄೳͳΦϖϥϯυ 12 structಉ༷ɺanyܕ΋஫ҙʂ

  13. ൺֱෆՄೳͳܕͷൺֱ

  14. ൺֱෆՄೳͳܕͷൺֱ 14 ඪ४ϥΠϒϥϦͷre f lectΛ࢖༻͢Δ

  15. ൺֱෆՄೳͳܕͷൺֱ 15 re f lect.DeepEqualؔ਺͸2ͭͷ஋Λ࠶ؼతʹḷͬͯɺ2ͭͷཁૉ͕౳͍͠ ͔൱͔Λ൑அ͢Δɻ ͜Ε͸جຊσʔλܕɺ഑ྻɺߏ଄ମɺεϥΠεɺϚοϓɺϙΠϯλɺΠϯλʔ ϑΣΠεɺؔ਺ʹ࢖༻Ͱ͖Δɻ

  16. re f lect.DeepEqualͷྫ 16

  17. re f lect.DeepEqualͷ஫ҙ఺ 17 nilίϨΫγϣϯͱۭίϨΫγϣϯΛ۠ผ͢Δ(ϢʔεέʔεʹΑͬͯ͸໰୊ͱͳΔɻ ྫ͑͹2ͭͷΞϯϚʔγϟϧૢ࡞ͷ݁ՌΛൺֱ͍ͨ࣌͠) ϦϑϨΫγϣϯΛ࢖͍ͬͯΔͷͰɺੑೳ্ͷϖφϧςΟ͕͋Δ ϕϯνϚʔΫͰ͸ɺ==ͷ໿100ഒ஗͍ύϑΥʔϚϯεɻຊ൪Ͱ͸࢖ͬͯ͸μϝ

  18. ಠࣗͷൺֱϝιουΛ࣮૷͢Δ 18 ಠࣗͷൺֱϝιουΛ࢖༻͢Δͱɺ ύϑΥʔϚϯε໰୊͕վળ͢Δɻ ࠨͷίʔυ͸re f lect.DeepEqualͷ໿96ഒߴ଎

  19. ϢχοτςετͰͷൺֱ 19 ϢχοτςετͰ͸ɺgo-cmp΍testifyͱ͍ͬͨ֎෦ϥΠϒϥϦΛ࢖༻Ͱ͖Δɻ ͔͠͠ɺ࣮ߦ࣌ͷੑೳ͕ॏཁͳ৔߹͸ɺಠࣗͷؔ਺Λ࣮૷͢Δ͜ͱ͕ϕετϓϥΫςΟεɻ

  20. ͦͷ΄͔ͷൺֱؔ਺ 20 ඪ४ϥΠϒϥϦʹ͸ɺbytes.Compareͱ͍͏2ͭͷbyteεϥΠεΛ ൺֱͰ͖ΔϥΠϒϥϦ͕ଘࡏ͢Δɻ ಠࣗͷؔ਺Λ࣮૷͢Δલʹɺंྠͷ࠶ൃ໌Λ͍ͯ͠ͳ͍͜ͱΛ֬ೝ͢Δʂ

  21. ൺֱՄೳͳΒ==, !=Λ࢖͏ ύϑΥʔϚϯεΛؾʹ͠ͳ͍ͳΒre f lectionΛ࢖༻͢Δ ύϑΥʔϚϯεΛؾʹ͢ΔͳΒಠ࣮ࣗ૷ ಠ࣮ࣗ૷͢ΔલʹطଘͷϥΠϒϥϦ͕ଘࡏ͢Δ͔ௐ΂Δ ·ͱΊ 21