I’ve wanted this myself, too, so I’m generally +1, although I’ve also wondered
if maybe this syntax should be changed somehow. I’ve not put a lot of thought
into it, and this perhaps has come up before, but I sort of wonder.. would it
make more sense to get rid of the trailing “while” entirely?
Here’s what I’m thinking:
This repeats forever - infinite loop:
repeat {}
And to get out of the infinite loop, you’d just use an if or guard the same way
you might in any other loop in some cases:
repeat {
let success = doSomething()
guard success else { break }
}
We could potentially even warn if you use a repeat {} without there being a
break inside the body somewhere.
This way, we eliminate a special syntactical form (repeat/while has always felt
weird in every brace-based language I’ve used) and just piggyback on the
existing break/continue/guard/if mechanisms that are already there and common.
Then we also don’t need to have a special “weird” rule where the scope of
variables change magically for repeat/while.
l8r
Sean
> On Jul 18, 2016, at 12:52 PM, Braeden Profile via swift-evolution
> <[email protected]> wrote:
>
> Good morning, Swift community!
>
> I’ve come across a situation a number of times where I write code that has to
> try something one or more times using a `repeat…while` loop and the condition
> relies upon variables that should be declared within the scope of the loop.
>
> repeat
> {
> let success = doSomething()
> }
> while !success
>
> The compiler unnecessarily prohibits this: “Use of unresolved identifier
> four.” In this simple case, we can write:
>
> repeat
> { }
> while !doSomething()
>
> But in a more complex situation, we are forced to write:
>
> var success: Bool
> repeat
> {
> success = doSomething()
> }
> while !success
>
>
> We could change this so that the declarations within the top level scope of
> the loop are accessible from the condition.
>
> Thanks for reading my first post to the Swift discussion board!
> —Braeden
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