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Rubyistなら知っておきたい継承の話 / The inheritance for Rubyist

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Avatar for Hiroyuki Morita Hiroyuki Morita
July 29, 2018
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Rubyistなら知っておきたい継承の話 / The inheritance for Rubyist

TokyuRuby会議 12

Avatar for Hiroyuki Morita

Hiroyuki Morita

July 29, 2018
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Transcript

  1. RubyistͳΒ஌ͬͯ ͓͖͍ͨ ܧঝͷ࿩ 2018/07/29 TokyuRubyձٞ12 @chiastolite as cͳΜͱ͔e a.k.a ࿦ཧແ৬

    a.k.a അ೑ձһূ

  2. ܧঝͱ͸?

  3. ܧঝ class Parent # ਌Ϋϥε end class Child < Parent

    # ࢠΫϥε end

  4. ਌͔ΒࢠʹҾ͖ܧ͕ΕΔ΋ͷ͸ʁ

  5. ! ! ῡ

  6. Ҩ࢈૬ଓ

  7. Ҩ࢈૬ଓͷجຊ 1. ඃ૬ଓਓͷࡒ࢈ͷ૞ࡧ 2. ඃ૬ଓਓͷࡒ࢈ͷ෼ׂΛڠٞ 3. (ඞཁͰ͋Ε͹) ૬ೲ੫ͷೲ෇

  8. ૬ଓ੫ͷਃࠂ

  9. ૬ଓ੫ͷਃࠂɾೲ෇͸10ϲ݄Ҏ಺ begin start = Time.now if ਃࠂ͕ඞཁ? ਃࠂ ೲ੫ raise

    'ظݶΦʔόʔ' if Time.now > start + 10.months end rescue ೲ੫ֹ + ແਃࠂՃࢉ੫ + Ԇ଺੫ end

  10. ਃࠂͷ൑ఆ͸? جૅ߇আ = 30_000_000 def ਃࠂ͕ඞཁ? ૬ଓֹ > جૅ߇আ +

    ૬ଓਓ * 6_000_000 end def ૬ଓֹ amount ||= 0 amount += parent.ݱۚ amount += parent.༬ஷۚ amount += parent.ূ݊ amount += parent.౔஍ amount += parent.ݐ෺ amount += parent.ࣗಈं amount -= parent.࠴຿ end

  11. ૬ଓ੫ͷઅ੫

  12. ૬ଓֹΛઅ੫͢Δʹ͸ → ੜલଃ༩ → ॅ୐΍Βڭҭ΍ΒͷࢧԉΛͯ͠΋Β͏ → ౔஍ͳͲΛങ͏ͱࢿ࢈ֹ͕ 㽊 → ඇ՝੫ͷࢿ࢈Λങ͏

    → ಛྫΛ࢖͏ →খن໛୐஍౳ͷಛྫ

  13. ͦΕͰ΋ӽ͑ͯ͠·ͬͨΒʁ

  14. ͖͋ΒΊ·͠ΐ͏ɻਃࠂͩʂ

  15. ୭ʹཔΉʁ → ۜߦ → หޢ࢜ → ੫ཧ࢜ → ࢘๏ॻ࢜ →

    ߦ੓ॻ࢜ ͩΕʹཔΊ͹͍͍ͷ΍Β…

  16. !

  17. ͜ͷࡍɺࣗ෼Ͱ΍ͬͯ͠·͑͹͍͍ͷ͸ʁ

  18. ͱ͍͏Θ͚Ͱ΍ͬͯΈͨ → ܭࢉͱ͔͸هೖྫ͕ͪΌΜͱ͋ΔͷͰ؆୯ → Ձ஋͕໌֬ͳݱۚ࠷ߴ

  19. ਃࠂͷ໘౗ͳͱ͜Ζ → खॻ͖ॻྨ࠷ѱ →هೖϛε͸ڐ͞Εͳ͍… → ඃ૬ଓਓͷੜ·Ε͔ͯΒͷށ੶౽ຊूΊ → ਃࠂઌ͸ʮඃ૬ଓਓʯͷ࠷ऴډॅ஍ → Ͳ͜ʹݴͬͯ΋ʮ͓౴͑Ͱ͖ͳ͍ʯ

  20. ·͍͊Ζ͍Ζ͋Γ·͕ͨ͠

  21. ͳΜͱ͔ͳΔ΋ͷ

  22. ࠷ޙʹ

  23. ࣄલͷ৘ใେࣄ → ށ੶͸Ͳ͜ʹ͋Γͦ͏ʁ → Ͳͷۚ༥ػؔ࢖ͬͯΔʁ → ӅΕͨࢿ࢈ͳ͍ʁ

  24. ੠Λฉ͔͕ͤͯΒͦΜͳ࿩Λͯ͠Έͯ͸?