[Swift-devel] Re: How to wait on functions that return no data?

[Ben Clifford]

On Tue, 25 Mar 2008, Mihael Hategan wrote:

> > where each element is of type 'maybe resultfile' and so can (independent 
> > of the other elements) be a file or null.
> 
> pretty much like try {a[x] = f(x)} catch {} or maybe(a[x] = f(x)).

in the array case, sort of, yes.

Doesn't compare so well when passing round a single non-array value though 
- a = Nothing is different from a not being assigned (yet, or never), 
which is what syntax this like: try { a =f(x) } catch {} alludes to.

The try/catch syntax also alludes to a null response being somehow 
exceptional, rather than a legitimate return value.

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