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4XJGUͷNBQͱqBU.BQΛ ࡶʹղઆ͢Δ !IJSPOZUJDʢҰٶߒڭʣ UPLVTIJNBBQQ

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"SSBZͷNBQ let array: [Int] = [1, 3, 8] array.map {x in x + 1}

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ͪΐͬͱ୤ઢ array.map {x in x + 1} array.map({ (x: Int) -> Int in return x + 1 })

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"SSBZͷNBQ let array: [Int] = [1, 3, 8] array.map {x in x + 1}

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"SSBZͷNBQ let array: [Int] = [1, 3, 8] array.map {x in x + 1} f(x) f(x) f(x) f(x) = x + 1

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"SSBZͷNBQ let array: [Int] = [1, 3, 8] array.map {x in [x, x + 1]}

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"SSBZͷNBQ let array: [Int] = [1, 3, 8] array.map {x in [x, x + 1]} f(x) f(x) f(x) f(x) = [x, x + 1]

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"SSBZͷqBU.BQ let array: [Int] = [1, 3, 8] array.flatMap {x in [x, x + 1]} f(x) f(x) f(x) f(x) = [x, x + 1]

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0QUJPOBMͷNBQ let value: Int? = … value.map {x in x + 1}

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·ͨ·ͨ୤ઢ [Int] Array Int? Optional

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0QUJPOBMͷNBQ let value: Int? = … value.map {x in x + 1}

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0QUJPOBMͷNBQ let value: Int? = … value.map {x in x + 1} let value: Int? = 16 value.map {x in x + 1} f(x) let value: Int? = nil value.map {x in x + 1} OJM OJM

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ΞΠςϜ਺ σʔλ͕ͳ͍ ΞΠςϜ਺ σʔλ͕͋Δ "SSBZ <> <> 0QUJPOBM OJM /POF 4PNF "SSBZͱ0QUJPOBM OJM

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NBQ let array: [Int] = [] array.map {x in x + 1} -> [] let array: [Int] = [16] array.map {x in x + 1} -> [17] let value: Int? = nil value.map {x in x + 1} -> nil let value: Int? = 16 …Int?(16) value.map {x in x + 1} -> 17 …Int?(17)

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qBU.BQ let array: [Int] = [] array.flatMap {x in [x + 1]} -> [] let array: [Int] = [16] array.flatMap {x in [x + 1]} -> [17] let value: Int? = nil value.flatMap {x in Int?(x + 1)} -> nil let value: Int? = 16 …Int?(16) value.flatMap {x in Int?(x + 1)} -> 17 …Int?(17)

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0QUJPOBMͷqBU.BQ let value: Int? = … value.flatMap {x -> Int? in if (x < 1) { return nil // ܭࢉࣦഊ } else { return x - 1 } }

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·ͱΊ func plusOne(x: Int) -> Int { return x + 1 } let array: [Int] = [1, 3, 8] array.map(plusOne) let value: Int? = 16 value.map(plusOne) w NBQ͸ശ͔Βग़ͯ͠ɺؔ਺Λద༻ ͯ͠ശʹೖΕΔɻ w qBU.BQ͸ശ͔Βग़ͯ͠ɺؔ਺Λ ద༻ͯ͠ϑϥοτʹശʹೖΕΔɻ w NBQ qBU.BQΛ࢖͏ͱɺͦ͜ʹ ౉͞ΕΔؔ਺͸֎ଆͷੈքΛҙࣝ ͠ͳ͍͍ͯ͘ʂ

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