I don't think I'm personally sold on this proposal either, but I'm curious
what bad experiences you've had with post-fix conditionals. I haven't
personally used a language with post-fix conditionals and it sounds like
that might be to my benefit :)
On Mon, Nov 2, 2020 at 9:09 PM 'Dan Kortschak' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> My first professional programming language was Perl, decades later I
> still wake up in a sweat thinking about post-fix conditionals and the
> 'unless' conditional.
>
> Please no.
>
> On Mon, 2020-11-02 at 14:26 -0800, Jeffrey Paul wrote:
> > Hello Gophers,
> >
> > There's two tiny pieces of syntactic sugar I really miss from a few
> > other languages that I think would add a nice bit of ergonomics and
> > convenience to Go (which I now play as my main) without increasing
> > any magic or spooky action at a distance.
> >
> > They are:
> >
> > - postfix conditionals
> >
> > and
> >
> > - until (while!) and unless (if!) (which probably also means adding
> > `while`)
> >
> > This allows for lovely expressions such as the following examples:
> >
> > i.NotifySomeone() if j.HasExpiredItems()
> >
> > time.Sleep(1 * time.Second) until thing.IsReady()
> >
> > b.ReportActivity(e) unless u.HasOptedOut()
> >
> > q.ProcessItem() while server.Active()
> >
> > until(time.Now().After(notAfter)) {
> > // do something while we still can
> > }
> >
> > p.processEvents() until p.shutdownRequested
> >
> > and, my favorite:
> >
> > panic("can't even") if err != nil
> >
> > There are, of course, various ways of doing some of this sort of
> > synchronization stuff in these contrived examples using
> > channels/goroutines/timers, but this sort of syntax is quite useful
> > for simple straight-line synchronous code, and, in my view, increases
> > readability without sacrificing anything.
> >
> > I know that `while` isn't a distinct thing in Go, and for
> > consistency's sake, this might necessitate adding such a construct as
> > well (if you can use it as a postfix conditional, you should probably
> > be able to use it as `while(cond) {}` too).
> >
> > What do you think? I really miss this syntax from other
> > languages. It's been in Perl and Ruby for ages, and, more recently,
> > CoffeeScript had it for a moment, but it didn't make it over into ES
> > with the other notable features from it. I think it's a lovely
> > convenience without changing the operation of the language itself.
> >
> > Best,
> > -sneak
> >
>
>
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