[ruby-talk:16014] Re: new keyword idea: tryreturn, tryturn or done

"Juha Pohjalainen" <[e-mail]> wrote in message
news:[e-mail]...
> On Wed, May 30, 2001 at 07:41:25AM +0900, Wayne Blair wrote:
> > I always had a love/hate relationship with the efficient but cryptic:
> >
> > if (x=getValue) return x
>
> More recently my love/hate relationship with such code has turned
> to be hate/hate relationship. :-(
>
> First, I don't like using too short and meaningless variable names.
> Secondly, above code opens up possibility for errors like:
> if (x==getValue) return x
>
> That is, if you come later back to that code (or someone
> else comes back) one year later, and have to change something,
> meaning of original code might have been forgotten and cryptic
> code does not help.
>
> > I like the idea of creating something less cryptic and just as
efficient,
> > but your implementation doesn't seem to make it less cryptic or more
> > efficient.
>
> I think it is less cryptic, because it states your intention.

No matter how you name it, I don't think it states your intention
intuitively,
because you have to interpret the block - in other words you have to
understand the convention pretty thoroughly to get it, just like you would
have to understand the C-convention, which I agree sucks but POLS tells me
to
stick with an existing convention rather than introduce a new one unless it
offers significant benefits.  The advantage of the C-convention over yours
is that
you can at least see it and analyze it in one place.  If revealing intention
is your real goal,
then I think the long version with intention revealing variable names is
preferable to
what you are proposing - especially because the code is right in front of
you.

> I think it is more efficient, because no need for temporary variable.

tryturn( scientists ) {|x| return x} in your example creates a temporary
variable in the block.
It also generates another method call and potentially a yield to a block.


Anyway, your code is interesting enough to keep me thinking about it for
awhile - would like to
see your thoughts on additional power of this technique.

Wayne