[swift-evolution] [Proposal] function "return" optional keyword.

[Félix Cloutier]

Just food for thought: C# has a special syntax, inspired by its own lambda syntax, for single-expression functions:

> // lambda syntax
> param => param + 4
> 
> // single-expression method syntax
> int AddFour(int param) => param + 4;

Swift's syntax for declaring functions and lambdas are harder to link like that though.

Félix

> Le 19 déc. 2015 à 23:26:49, Jordan Rose via swift-evolution <swift-evolution at swift.org> a écrit :
> 
> I'm not going to go as far as a definitive +1, but I've definitely wanted this for var and subscript getters. If it were limited to single-expression functions, I don't see much harm. The only time there'd be a problem is if the return types matched and you were going to have another statement instead.
> 
> It feels weird for anything imperative, but I think the whole point is that there are plenty of functions which do absolutely no imperative work. I personally wouldn't want people to start using it for forwarding imperative things, though.
> 
> func sendHTTPRequest() -> Result {
>   sendHTTPRequestImpl(destinationURL, body)
> }
> 
> Jordan
> 
> 
>> On Dec 19, 2015, at 5:30 , Craig Cruden via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> 
>> When writing short functional code in a function it would be nice if the return keyword were an optional keyword. 
>> 
>> Just return the last evaluated expression.
>> 
>> 
>> i.e.
>> 
>>     func flipFunc<T, U>(arg1: T, arg2: U) -> (U, T) {
>>         (arg2, arg1)
>>     }
>> 
>> 
>> The keyword return would still be there for breaking out of a function.
>> 
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> 
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