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func makeIncrementor(forIncrement amount: Int) -> () -> Int { var runningTotal = 0 func incrementor() -> Int { runningTotal += amount return runningTotal } return incrementor } let incrementByTen = makeIncrementor(forIncrement: 10) // 返回的值为10 incrementByTen() // 返回的值为20 incrementByTen() // 返回的值为30 incrementByTen() // 返回的值为40 incrementByTen() let alsoIncrementByTen = incrementByTen // 返回的值也为50 print(alsoIncrementByTen())
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