[swift-users] syntax suggestion

[Jordan Rose]

Hi, Rangding. This is a known issue, tracked by SR-1846 <https://bugs.swift.org/browse/SR-1846>. Essentially the compiler is not smart enough to know that you mean the existing function 'data' rather than the variable you are defining.

Best,
Jordan


> On Oct 27, 2016, at 19:06, 张让定 via swift-users <swift-users at swift.org> wrote:
> 
> Dear Sir/madam,
> I have a fuction:
> 
> import Foundation
> 
> public func data(with string:String?) -> Data? {
>     if let string = string {
>         return string.data(using: String.Encoding.utf8)
>     }
>     return nil
> }
> When I use it like:
> 
> let data = data(with: "Hello")
> There is a compile error: variable used within it's own initial value.
> 
> If write like:
> 
> let stringData = data(with: "Hello")
> Everything is OK.
> 
> So I wonder why not support the syntax like:
> 
> let data = data(with: "Hello")
> 
> Yours sincerely
> Rangding Zhang
> 
> 
>  
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