Mobile Programming Closure

Mobile Programmingの授業のスライドです

Transcript

1. Ϋϩʔδϟ .PCJMF1SPHSBNNJOH
   0DU
   UI
2. ແ໊ؔ਺ Ϋϩʔδϟ
3. ແ໊ؔ਺ Ϋϩʔδϟ ͱ͸ʁ w ໊લͷ௨Γ໊લͷͳ͍ؔ਺
   w ໊લ͖ͭؔ਺ͱେ͖͘ҧ͏ͱ͜Ζ͸
   w ม਺ʹೖΕΒΕΔ
   w ஋ͱͯ͠ѻ͑Δͱ͍͏ͱ͜Ζ
   w ߏจ΋एׯมΘΓ·͢
   w ϥϜμࣜͳΜͯݺͼํ΋
4. Ϋϩʔδϟ෼ΫοΩϯά { } w ೋͭͷ਺஋Λड͚औͬͯ଍͠߹ΘͤΔؔ਺Λߟ͑·͢
   w ·ͣ͸Ϋϩʔδϟͷ࢝·ΓͰ͋Δ
   \^
   Λهड़ ·ͣ͸͜Εʂ
5. Ϋϩʔδϟ෼ΫοΩϯά { (number1: Int, number2: Int) -> Int in } w ࣍ʹΫϩʔδϟ͕ड͚औΔ஋
   Ҿ਺
   Λઃఆ͍͖ͯ͠·͢
   w ࠓճ͸଍͠ࢉͷؔ਺ͳͷͰҾ਺͸ೋͭʹͳΓ·͢
   w ؔ਺ͱಉ͡Α͏ʹҾ਺͸
   ໊લܕ
   ͱ͍͏ܗͰఆٛ͞Ε
   w ෳ਺͋Δ৔߹͸ΧϯϚͰ۠੾Γ·͢ Ҿ਺ Ҿ਺ Ҿ਺ಉ࢜͸ΧϯϚͰ۠੾Δ
6. Ϋϩʔδϟ෼ΫοΩϯά w ࣍ʹ໭Γ஋ΛܾΊ·͢
   w ྫ͑͹ࠓճ͸଍͠ࢉͷؔ਺ͳͷͰ*OUܕΛҰͭฦ͠·͢
   w Կ΋ฦ͢΋ͷ͕ͳ͍৔߹͸লུՄೳͰ͢
   w ͪͳΈʹฦΓ஋ͱ΋ݴͬͨΓ͠·͕͢৭ʑΞϨͳͷͰࠓճ͸໭Γ஋ͱݺͼ·͢
   w ΫϩʔδϟͰ͸໭Γ஋ͷޙʹ
   JO
   ͱ͍͏Ωʔϫʔυ͕ඞཁʹͳΓ·͢ ͜ͷ෦෼͕໭Γ஋ { (number1: Int, number2: Int) -> Int in } ๨Εͣʹʂ
7. Ϋϩʔδϟ෼ΫοΩϯά { (number1: Int, number2: Int) -> Int in let result = number1 + number2 return result } w ࠷ޙʹΫϩʔδϟͷத਎Λهड़͍͖ͯ͠·͢
   w ໭Γ஋͕͋Δؔ਺ͷ৔߹͸ඞͣ࠷ޙʹ
   w SFUVSOΛ࢖༻ͯ͠஋Λฦ͢ඞཁ͕͋Γ·͢
   ໭Γ஋Λฦ͢ ؔ਺Ͱߦ͏ॲཧ
8. Ϋϩʔδϟͷݺͼग़͠ w ؔ਺ͱಉ༷ʹΫϩʔδϟ͸ݺͼग़͞ΕΔ·Ͱ͸࣮ߦ͞Εͳ͍
   w ͦͷͨΊఆٛͨ͠ޙʹඞͣݺͼग़͢ඞཁ͕͋Δ
   w ΫϩʔδϟΛݺͼग़͢৔߹͸جຊతʹҰ౓ม਺ʹೖΕΔඞཁ͕͋Δ // Ϋϩʔδϟͷఆٛ let closure = { (number1: Int, number2: Int) -> Int in let result = number1 + number2 return result } // Ϋϩʔδϟͷݺͼग़͠ let added = closure(10, 10) print("result is: \(added)") // 20
9. ؔ਺ܕҾ਺ ճ໨
10. ؔ਺ܕҾ਺ʁ w ઌ΄Ͳઆ໌ͨ͠ΫϩʔδϟΛҾ਺ʹͨ͠ͱ͖ͷ໊લ
    w Ϋϩʔδϟ͸஋ͱͯ͠ѻ͑ΔͨΊؔ਺ͷҾ਺ʹ΋౉͢͜ͱ ͕Ͱ͖Δ
    w ܁Γฦ͠ͷ࣌ʹग़͖ͯͨNBQ΋ΫϩʔδϟΛҾ਺ʹͱΔ ؔ਺Ͱ͋Δ
11. ؔ਺ܕҾ਺ʁ // ΫϩʔδϟΛҾ਺ʹؚΉؔ਺ఆٛ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ؔ਺ݺͼग़͠(ΫϩʔδϟҎ֎ͷҾ਺ΛຒΊΔ) calculate(number1: 10, number2: 10, calc:)
12. ؔ਺ܕҾ਺ʁ // ΫϩʔδϟΛҾ਺ʹؚΉؔ਺ఆٛ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ؔ਺ݺͼग़͠(Ϋϩʔδϟͷ࢝·ΓͷΧοίΛॻ͍ͯɾɾɾ)͘ calculate(number1: 10, number2: 10, calc: { })
13. ؔ਺ܕҾ਺ʁ // ΫϩʔδϟΛҾ਺ʹؚΉؔ਺ఆٛ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ؔ਺ݺͼग़͠(Ҿ਺ͷ໊લͱܕͱ໭Γ஋ͷܕΛॻ͍ͯɾɾɾɾ) calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int })
14. ؔ਺ܕҾ਺ʁ // ΫϩʔδϟΛҾ਺ʹؚΉؔ਺ఆٛ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ؔ਺ݺͼग़͠(in ΩʔϫʔυΛॻ͍ͯɾɾɾ) calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int in })
15. ؔ਺ܕҾ਺ʁ // ΫϩʔδϟΛҾ਺ʹؚΉؔ਺ఆٛ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ؔ਺ݺͼग़͠(࠷ޙʹॲཧΛॻ͘ɾɾɾ) calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int in return num1 + num2 })
16. 0I
    .Z
    (PPPPPPPPPPPPPPPPPPPPPPPPP
17. ྲྀੴʹΊΜͲ͍͘͞
18. Ϋϩʔδϟͷলུه๏
19. ͖ͬ͞ͷྫΛ΋͏Ұ౓ // ͬͪ͜͸লུͰ͖ͳ͍͕ɾɾɾ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ͬͪ͜͸লུ͢Δͱɾɾɾ calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int return num1 + num2 }) ͜ͷ௕͍Ϋϩʔδϟ͕͋Δ͡ΌΖʁ
20. ͖ͬ͞ͷྫΛ΋͏Ұ౓ // ͬͪ͜͸লུͰ͖ͳ͍͕ɾɾɾ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ͬͪ͜͸লུ͢Δͱɾɾɾ calculate(number1: 10, number2: 10) { (num1, num2) in return num1 + num2 } ͜ΕΛ͜͏ͯ͠ɾɾɾ
21. ͖ͬ͞ͷྫΛ΋͏Ұ౓ // ͬͪ͜͸লུͰ͖ͳ͍͕ɾɾɾ func calculate(number1: Int, number2: Int, calc: ((Int, Int) -> Int)) -> Int { return calc(number1, number2) } // ͬͪ͜͸লུ͢Δͱɾɾɾ calculate(number1: 10, number2: 10ʣ{ $0 + $1 } ͜͏͡Όʂ
23. ॱΛ௥ͬͯઆ໌͠·͢
24. Ϋϩʔδϟͷޙஔه๏
25. Ϋϩʔδϟͷޙஔه๏ w ؔ਺ͷҾ਺ͷ࠷ޙ͕Ϋϩʔδϟͷ৔߹ͦͷΫϩʔδϟΛҾ ਺Ϧετͷ֎ʹग़͢͜ͱ͕Ͱ͖·͢
    w ͜ΕΛΫϩʔδϟͷޙஔه๏ 5SBJMMJOH
    $MPTVSF ͱݺͼ· ͢ calculate(number1: 10, number2: 10) { (num1: Int, num2: Int) -> Int in return num1 + num2 } calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int return num1 + num2 }) #FGPSF "GUFS
26. Ϋϩʔδϟͷܕͷলུ
27. Ϋϩʔδϟͷܕͷলུ w 4XJGUʹ͸ܕਪ࿦͕͋ΔͨΊΫϩʔδϟͷҾ਺ͱ໭Γ஋ͷ ܕΛলུͰ͖Δ৔߹͕͋Γ·͢ calculate(number1: 10, number2: 10) { (num1, num2) in return num1 + num2 } calculate(number1: 10, number2: 10) { (num1: Int, num2: Int) -> Int in return num1 + num2 } #FGPSF "GUFS
28. Ϋϩʔδϟͷม਺໊ͷ লུ
29. Ϋϩʔδϟͷม਺໊ͷলུ w Ϋϩʔδϟͷॲཧ͕ߦͰࡁΉ৔߹͸ม਺ͷ໊લ΋লུ͢Δ͜ͱ͕ Ͱ͖·͢
    w ୅ΘΓʹ
    O
    ͱ͍͏දهΛ࢖͍·͢
    w Ҿ਺͕ෳ਺͋Δ৔߹͸ࠨ͔Β
    
    ʜͱ͍͏ܗʹͳΓ·͢
    w ·ͨɺSFUVSO
    ΋লུՄೳͰ͢ calculate(number1: 10, number2: 10) { $0 + $1 } calculate(number1: 10, number2: 10) { (num1, num2) in return num1 + num2 } #FGPSF "GUFS