function can return another function use in swift

Question

Functions are a first-class type. This means that a function can return another function as its value.

func makeIncrementer() -> (Int -> Int) {
func addOne(number: Int) -> Int {
    return 1 + number
}
return addOne
}
var increment = makeIncrementer()
increment(7)

when i implement this i got the following error:

Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254

Also where this functionality can be useful in realtime solutions?

Your code looks fine. Its working for me without any modification. error is something else — Anil Varghese
– Anil Varghese, Commented Jun 13, 2014 at 7:17
@Anil after using M M. answer i am able to solve the problem. — Manish Agrawal
– Manish Agrawal, Commented Jun 13, 2014 at 7:20

masoud · Accepted Answer · 2014-06-13 07:11:53Z

3

Per documentation, your function declaration should be like below code, See the parentheses around Int. It indicates the entry parameters.

func makeIncrementer() -> (Int) -> Int
                          ^^^^^^^^^^^^

This funcionality can make it easier to have dynamic code based on a value in run-time.

edited Jun 13, 2014 at 7:11

answered Jun 13, 2014 at 7:04

masoud

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