Okay, that makes sense. Thanks, all.
On Mon, Nov 21, 2016 at 10:07 AM, Leif Andersen <l...@leifandersen.net>
wrote:
> Honestly, I personally like to use let/ec for this. I know it's still
> using continuations, but it is much more lightweight, both syntactically
> and in terms of run-time costs.
>
> (define (do-something)
> (let/ec return
> (unless (some-condition)
> (return NO))
>
> (do-the-thing)))
>
> Although honestly, with this pattern, I find that errors work better here,
> as they return early, and you can decide how they get handled with a
> with-handlers.
>
> (define (do-something)
> (unless (some-condition)
> (error "NO"))
> (do-the-thing))
>
> (with-handlers ([exn:fail? (lambda (e) (displayln "I returned early"))])
> (do-something))
>
> But that is specifically because I prefer the workflow of catching errors,
> rather than always having to manually check the output of the function....
> (I'm looking at you C...)
>
> Hope that helps.
>
>
> ~Leif Andersen
>
> On Mon, Nov 21, 2016 at 12:41 PM, David Storrs <david.sto...@gmail.com>
> wrote:
>
>> Edit: I know I could also use call/cc and invoke the continuation to
>> escape, but that still adds another layer of indentation for something that
>> in the normal case won't be called.
>>
>> It's not a big deal, but I was wondering about it.
>>
>> On Mon, Nov 21, 2016 at 9:37 AM, David Storrs <david.sto...@gmail.com>
>> wrote:
>>
>>> In Perl I would often write:
>>>
>>> sub do_something {
>>> return unless ( some necessary condition is met );
>>> ... do the thing ...
>>> }
>>>
>>> In Racket I could wrap the rest of the procedure in an (if), but that
>>> adds an unnecessary level of indentation and feels clunky. Is there a
>>> clean solution?
>>>
>>>
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