From: Phrogz <phrogz@...>
Date: 2007-09-12T07:55:09+09:00
Subject: Re: Is this a bug or a feature?

On Sep 11, 4:25 pm, Martin Jansson <martia...@bigfoot.com> wrote:
> > You can do:
>
> >   begin
> >     # do stuff
> >   end until condition
>
> Thats just confusing. Why does that work different then "do_stuff until
> condition".

Consider this:
  if foo() then
    bar()
  end

  bar() if foo()

In both cases foo() is called before bar(), even though in one of the
cases it appears later in source code. The 'if' can go in different
places. Similarly with while and until. Now, sometimes you (both the
general populace and you in particular) want to evaluate after the
first iteration. For such cases we need a different syntax.

Do you have a better suggestion for how to differentiate between
evaluate-first and evaluate-after-one-iteration, that is also
consistent with if/unless?