On Mon, Sep 05, 2005 at 12:35:36PM +0900, Dan Kogai wrote:
> And I found that these can be made much, much simpler and more
> intuitive with Perl 6, even more so than scheme!
>
> our $ZERO = sub($f){ sub($x){ $x }};
> our $SUCC = sub($n){ sub($f){ sub($x){ $f.($n.($f)($x)) }}};
> our $ADD = sub($m){ sub($n){ sub($f){ sub($x){ $m.($f)($n.($f)
> ($x)) }}}};
> our $MULT = sub($m){ sub($n){ sub($f){ $m.($n.($f)) }}};
> our $POW = sub($m){ sub($n){ $n.($m) }};
Nice! Also the pointy notation may or may not be clearer:
-> $f { -> $x { $x } }
Also, you can use the & sigil:
our &SUCC := sub(&n){ sub(&f){ sub(&x){ f(n(&f)(&x)) }}};
which may or may not be clearer... probably not, come to think about it.
> P.S. I am surprised to find Pugs does not include this kind of
> sample scripts.
I'm surprised to find dan-san is not a Pugs committer. I've remedied
this situation by sending you an invitation. The commit URL is the
same as the anonymous checkout svn URL.
Please commit them into the suitable examples/ subdirectory, probably
"algorithms". Also please add yourself to AUTHORS. Welcome aboard!
Thanks,
/Autrijus/
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