Loop macros (was: Re: macro definition for continue and break)

[Maxime Devos]

On 12-09-2022 21:19, Linus Björnstam wrote:
> If you want a bit more advanced looping you could have a look at my goof-loop: 
> https://git.sr.ht/~bjoli/goof-loop
>
> It currently does not support a break or continue clause, but adding one should 
> not really be a problem.
>
> A good thing is that it does not rely on mutation for anything except higher 
> order sequences, meaning it does not lead to the implicit boxing overhead of 
> set!, which is a good idea in loops since that quickly adds up.
>
> Best regards
>    Linus Björnstam

I also have a mutation-free loop macro, named 'hat-let' or 'let^':

https://git.gnunet.org/gnunet-scheme.git/tree/gnu/gnunet/utils/hat-let.scm

Its origin is rather different though, goof-loop appears to be the 
result of combining various loop-related constructs, plus some extras, 
whereas let^ is the result of combining various binding constructs 
(including the 'let loop'), plus some extras.

It combines the following: let*, lambda / define, receive, 'let loop', 
'if', 'begin'.

Doesn't do any accumulation though.

Greetings,
Maxime.

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