[swift-users] Can anyone please explain this behavior?

[Zhao Xin]

I suggest you defining the variables before using them like Marco does.
Although from the global variable point of view, both way should be fine.
But the glitch does exist, especially in playground.

Zhaoxin

On Thu, Sep 22, 2016 at 5:59 AM, Marco S Hyman via swift-users <
swift-users at swift.org> wrote:

>
> > On Sep 21, 2016, at 2:22 PM, Jens Persson via swift-users <
> swift-users at swift.org> wrote:
> >
> > // This little Swift program compiles (and runs) fine:
> >
> > func foo() -> Int { return a }
> > let a = 1
> > let b = 2
> > print(foo())
> >
> > But if `foo()` returns `b` instead of `a`, I get this compile time error:
> > "Use of unresolved identifier `b`”
>
> Interesting.  Seems to have something to do with ordering as if you code
> it this way:
>
> let a = 1
> let b = 2
> func foo() -> Int { return b }
> print(foo())
>
> it works fine (Xcode 8 playground).
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