Swift 柯里化(currying)和反柯里化(uncurrying)

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// Demo of currying@H_502_1@

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func addTwoNums(a: Int)(num: Int) -> Int {@H_502_1@

return a + num@H_502_1@

}@H_502_1@

@H_502_1@

let addToFour = addTwoNums(4)@H_502_1@

let result = addToFour(num: 6)@H_502_1@

print("result: \(result)")@H_502_1@

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func greaterThan(comparor: Int)(input: Int) -> Bool {@H_502_1@

return input > comparor@H_502_1@

}@H_502_1@

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let greaterThan10 = greaterThan(10)@H_502_1@

let b1 = greaterThan10(input: 10)@H_502_1@

let b2 = greaterThan10(input: 4)@H_502_1@

print("b1: \(b1)")@H_502_1@

print("b2: \(b2)")@H_502_1@

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// Demo of uncurrying@H_502_1@

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let foo = {(a: Int) -> (Int) -> Int in@H_502_1@

return {(b: Int) -> Int in@H_502_1@

return a * a + b * b@H_502_1@

}@H_502_1@

}@H_502_1@

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let interesting = foo(3)(4)@H_502_1@

print("interesting: \(interesting)")@H_502_1@

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let interestingAgain = (foo(3))(4)@H_502_1@

print("interestingAgain: \(interestingAgain)")@H_502_1@