Megacut - a clojure-like lambda shorthand

Megacut - a clojure-like lambda shorthand

[Linus Björnstam]

Hello everybody!

I have written a bunch of small libraries to scratch some itches, and I thought now might be a good time to actually release them here. 

Megacut is the first of a few. It is a lambda shorthand, like cut, but with different semantics and more features:

(megacut (apply + (/ %1 %2) %&))

(lambda (%1 %2 . %&) (apply + (/ %1 %2) %&))

Using guile's read-hash-extend #%(+ %1 %2) gets expanded to (megacut (+ %1 %2)).

The workings are simple: positional arguments are %n (where n is a positive integer) and rest arguments are %&. It adds as many positional arguments as n is big so #%(display %2) becomes (lambda (%1 %2) (display %2)). 

The symbol % is a shorthand for %1, so #%(+ % %) is the same as #%(+ %1 %1).

It can be found here: https://bitbucket.org/bjoli/megacut

Play with it if you want. It is licensed under a BSD-styled license. My linux box died recently, so I haven't been able to package it for guix.

Best regards
Linus Björnstam

Re: Megacut - a clojure-like lambda shorthand

[Amirouche Boubekki]

Thanks for sharing!

Le mar. 26 mars 2019 à 21:28, Linus Björnstam <linus.internet@fastmail.se>
a écrit :

> Hello everybody!
>
> I have written a bunch of small libraries to scratch some itches, and I
> thought now might be a good time to actually release them here.
>
> Megacut is the first of a few. It is a lambda shorthand, like cut, but
> with different semantics and more features:
>
> (megacut (apply + (/ %1 %2) %&))
>
> (lambda (%1 %2 . %&) (apply + (/ %1 %2) %&))
>
> Using guile's read-hash-extend #%(+ %1 %2) gets expanded to (megacut (+ %1
> %2)).
>
> The workings are simple: positional arguments are %n (where n is a
> positive integer) and rest arguments are %&. It adds as many positional
> arguments as n is big so #%(display %2) becomes (lambda (%1 %2) (display
> %2)).
>
> The symbol % is a shorthand for %1, so #%(+ % %) is the same as #%(+ %1
> %1).
>
> It can be found here: https://bitbucket.org/bjoli/megacut
>
> Play with it if you want. It is licensed under a BSD-styled license. My
> linux box died recently, so I haven't been able to package it for guix.
>
> Best regards
> Linus Björnstam
>
>