> On Jul 24, 2015, at 7:19 PM, Roland King <r...@rols.org> wrote:
>
> if let screen = window?.screen
> {
> find(…)
> }
> else
> {
> // handle the lack of a screen gracefully
> }
>
> it’s longer, but it’s clearer and it says I’ve considered what semantically
> it means to have a nil screen.
You may prefer the new `guard let` construct for this pattern.
> PS does anyone know (in swift 2.0) of a way to use the ternery operator with
> let/case so you can initialise a variable without curly braces everywhere, I
> want to write
>
> let myVar = ( let ifNotOptional = something?.something else ) ?
> ifNotOptional.stringName : “No Name”
>
> but can’t find any syntax to do something like that
You can separate the let declaration from the initialization, as long as the
compiler can see that it is assigned exactly once before it is used along all
code paths. The compiler recently became smarter at this analysis so it works
in more cases. (Downside: you must specify the variable's type.)
let myVar: String
if let value = something?.somethingElse {
myVar = value.stringName
} else {
myVar = "No Name"
}
--
Greg Parker gpar...@apple.com Runtime Wrangler
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