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

TokyuRuby会議 12

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͸?