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Mobile Programming Closure
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yuichiro_takahashi
October 22, 2018
Technology
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100
Mobile Programming Closure
Mobile Programmingの授業のスライドです
yuichiro_takahashi
October 22, 2018
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Transcript
Ϋϩʔδϟ .PCJMF1SPHSBNNJOH0DU UI
ແ໊ؔ Ϋϩʔδϟ
ແ໊ؔ Ϋϩʔδϟ ͱʁ w ໊લͷ௨Γ໊લͷͳ͍ؔ w ໊લ͖ͭؔͱେ͖͘ҧ͏ͱ͜Ζ w มʹೖΕΒΕΔ w
ͱͯ͠ѻ͑Δͱ͍͏ͱ͜Ζ w ߏจएׯมΘΓ·͢ w ϥϜμࣜͳΜͯݺͼํ
ΫϩʔδϟΫοΩϯά { } w ೋͭͷΛड͚औͬͯ͠߹ΘͤΔؔΛߟ͑·͢ w ·ͣΫϩʔδϟͷ࢝·ΓͰ͋Δ\^Λهड़ ·ͣ͜Εʂ
ΫϩʔδϟΫοΩϯά { (number1: Int, number2: Int) -> Int in }
w ࣍ʹΫϩʔδϟ͕ड͚औΔҾΛઃఆ͍͖ͯ͠·͢ w ࠓճ͠ࢉͷؔͳͷͰҾೋͭʹͳΓ·͢ w ؔͱಉ͡Α͏ʹҾ໊લܕͱ͍͏ܗͰఆٛ͞Ε w ෳ͋Δ߹ΧϯϚͰ۠Γ·͢ Ҿ Ҿ Ҿಉ࢜ΧϯϚͰ۠Δ
ΫϩʔδϟΫοΩϯά w ࣍ʹΓΛܾΊ·͢ w ྫ͑ࠓճ͠ࢉͷؔͳͷͰ*OUܕΛҰͭฦ͠·͢ w Կฦ͢ͷ͕ͳ͍߹লུՄೳͰ͢ w ͪͳΈʹฦΓͱݴͬͨΓ͠·͕͢৭ʑΞϨͳͷͰࠓճΓͱݺͼ·͢ w
ΫϩʔδϟͰΓͷޙʹJOͱ͍͏Ωʔϫʔυ͕ඞཁʹͳΓ·͢ ͜ͷ෦͕Γ { (number1: Int, number2: Int) -> Int in } Εͣʹʂ
ΫϩʔδϟΫοΩϯά { (number1: Int, number2: Int) -> Int in let
result = number1 + number2 return result } w ࠷ޙʹΫϩʔδϟͷதΛهड़͍͖ͯ͠·͢ w Γ͕͋Δؔͷ߹ඞͣ࠷ޙʹ w SFUVSOΛ༻ͯ͠Λฦ͢ඞཁ͕͋Γ·͢ ΓΛฦ͢ ؔͰߦ͏ॲཧ
Ϋϩʔδϟͷݺͼग़͠ w ؔͱಉ༷ʹΫϩʔδϟݺͼग़͞ΕΔ·Ͱ࣮ߦ͞Εͳ͍ w ͦͷͨΊఆٛͨ͠ޙʹඞͣݺͼग़͢ඞཁ͕͋Δ w ΫϩʔδϟΛݺͼग़͢߹جຊతʹҰมʹೖΕΔඞཁ͕͋Δ // 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
ؔܕҾ ճ
ؔܕҾʁ w ઌ΄Ͳઆ໌ͨ͠ΫϩʔδϟΛҾʹͨ͠ͱ͖ͷ໊લ w Ϋϩʔδϟͱͯ͠ѻ͑ΔͨΊؔͷҾʹ͢͜ͱ ͕Ͱ͖Δ w ܁Γฦ͠ͷ࣌ʹग़͖ͯͨNBQΫϩʔδϟΛҾʹͱΔ ؔͰ͋Δ
ؔܕҾʁ // ΫϩʔδϟΛҾʹؚΉؔఆٛ func calculate(number1: Int, number2: Int, calc: ((Int,
Int) -> Int)) -> Int { return calc(number1, number2) } // ؔݺͼग़͠(ΫϩʔδϟҎ֎ͷҾΛຒΊΔ) calculate(number1: 10, number2: 10, calc:)
ؔܕҾʁ // ΫϩʔδϟΛҾʹؚΉؔఆٛ func calculate(number1: Int, number2: Int, calc: ((Int,
Int) -> Int)) -> Int { return calc(number1, number2) } // ؔݺͼग़͠(Ϋϩʔδϟͷ࢝·ΓͷΧοίΛॻ͍ͯɾɾɾ)͘ calculate(number1: 10, number2: 10, calc: { })
ؔܕҾʁ // ΫϩʔδϟΛҾʹؚΉؔఆٛ func calculate(number1: Int, number2: Int, calc: ((Int,
Int) -> Int)) -> Int { return calc(number1, number2) } // ؔݺͼग़͠(Ҿͷ໊લͱܕͱΓͷܕΛॻ͍ͯɾɾɾɾ) calculate(number1: 10, number2: 10, calc: { (num1: Int, num2: Int) -> Int })
ؔܕҾʁ // ΫϩʔδϟΛҾʹؚΉؔఆٛ 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 })
ؔܕҾʁ // ΫϩʔδϟΛҾʹؚΉؔఆٛ 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 })
0I.Z (PPPPPPPPPPPPPPPPPPPPPPPPP
ྲྀੴʹΊΜͲ͍͘͞
Ϋϩʔδϟͷলུه๏
͖ͬ͞ͷྫΛ͏Ұ // ͬͪ͜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 }) ͜ͷ͍Ϋϩʔδϟ͕͋Δ͡ΌΖʁ
͖ͬ͞ͷྫΛ͏Ұ // ͬͪ͜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
͖ͬ͞ͷྫΛ͏Ұ // ͬͪ͜লུͰ͖ͳ͍͕ɾɾɾ func calculate(number1: Int, number2: Int, calc: ((Int,
Int) -> Int)) -> Int { return calc(number1, number2) } // ͬͪ͜লུ͢Δͱɾɾɾ calculate(number1: 10, number2: 10ʣ{ $0 + $1 } ͜͏͡Όʂ
None
ॱΛͬͯઆ໌͠·͢
Ϋϩʔδϟͷޙஔه๏
Ϋϩʔδϟͷޙஔه๏ w ؔͷҾͷ࠷ޙ͕Ϋϩʔδϟͷ߹ͦͷΫϩʔδϟΛҾ Ϧετͷ֎ʹग़͢͜ͱ͕Ͱ͖·͢ w ͜ΕΛΫϩʔδϟͷޙஔه๏ 5SBJMMJOH$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
Ϋϩʔδϟͷܕͷলུ
Ϋϩʔδϟͷܕͷলུ w 4XJGUʹܕਪ͕͋ΔͨΊΫϩʔδϟͷҾͱΓͷ 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
Ϋϩʔδϟͷม໊ͷ লུ
Ϋϩʔδϟͷม໊ͷলུ w Ϋϩʔδϟͷॲཧ͕ߦͰࡁΉ߹มͷ໊લলུ͢Δ͜ͱ͕ Ͱ͖·͢ w ΘΓʹOͱ͍͏දهΛ͍·͢ w Ҿ͕ෳ͋Δ߹ࠨ͔Β ʜͱ͍͏ܗʹͳΓ·͢ w
·ͨɺSFUVSOলུՄೳͰ͢ calculate(number1: 10, number2: 10) { $0 + $1 } calculate(number1: 10, number2: 10) { (num1, num2) in return num1 + num2 } #FGPSF "GUFS