How do you create an optional variable that is assigned a function in Swift

Question

I would like to create an optional variable that can be assigned a function ( or can be nil). I'm guessing it would look something like this but the following code does not compile.

var variableThatWillBeAssignedAFunction: {(Int) -> Int}?

Thanks for your help

Greg de J · Accepted Answer · 2020-03-24T06:26:21.857

2

var variableThatWillBeAssignedAFunction: ((Int) -> Int)?

To make it more readable, you can also use a typealias:

typealias IntegerTransform = (Int) -> Int
var variableThatWillBeAssignedAFunction: IntegerTransform?

edited Mar 24 '20 at 06:26

answered Mar 23 '20 at 14:33

Greg de J

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I was so close – code kid Mar 23 '20 at 17:46
Haha yes it takes a while to get used to :) I edited my answer with a more readable way, maybe this will help. – Greg de J Mar 24 '20 at 06:27

How do you create an optional variable that is assigned a function in Swift

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