Functions in Swift should be curried by default without the need for special syntax.
| Originator: | injahta | ||
| Number: | rdar://17223324 | Date Originated: | 06/08/2014 |
| Status: | Open | Resolved: | |
| Product: | Swift | Product Version: | |
| Classification: | Reproducible: |
Summary:
Functions in Swift can be curried using special syntax such as follows:
func addTwo(a:Int)(b:Int) -> Int {
return a + b
}
or
func addTwo(a:Int) -> (Int -> Int) {
func add(b:Int) -> Int {
return a + b
}
return add
}
However, it would be more desirable if all functions were able to be curried without special declaration, such that:
func addTwo(a:Int, b:Int) -> Int
is equivalent to
func addTwo(a:Int) -> (Int -> Int)
This should extend to all functions.
Steps to Reproduce:
1. Declare a function such as func addTwo(a:Int, b:Int) -> Int
2. Set it like so: let curried = addTwo(1)
Expected Results:
The curried constant is a function that takes a single Int and adds one to it.
Actual Results:
A complier error that states: "Cannot convert the expression's type 'Int' to type '(Int, Int)'"
Comments
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Wouldn't that break together with default arguments?
func addTwo(a:Int, b:Int = 2);
var x = addTwo(2) // is x an Int or an Int -> Int?