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### Re: (FoxUni) Re: the next step

by educated_foo (Vicar)
 on May 09, 2002 at 16:55 UTC ( #165428=note: print w/replies, xml ) Need Help??

in reply to Re: the next step

You can get pretty much the same techniques out of Haskell, but you'll miss currying.

```foo a b c = a ++ c ++ b
with_parens a b = foo a b
y = with_parens "<" ">"
then print (y "banana") prints "<banana>". BTW, if you haven't, you should definitely check out Haskell, as it can be a truly mind-bending experience. It's easy to get up and running with the HUGS interpreter, now with delicious readline support.

/s

Update: you won't miss the currying anymore...

```use strict;
use Carp;
use Attribute::Handlers;

sub _curry {
my (\$n, \$func, @args) = @_;
return sub {
my \$narg = @args + @_;
if (\$narg > \$n) {
carp "\$narg args to curried function (expects \$n).";
} elsif (\$narg < \$n) {
return _curry(\$n, \$func, @args, @_);
} else {
return &\$func(@args, @_);
}
};
}

sub curry : ATTR(CODE) {
my (\$package, \$symbol, \$code, \$name, \$n) = @_;
confess "Usage: sub mysub : curry(N), where N > 0"
unless \$n;
local(\$^W) = 0;
no strict 'refs';
my \$newsub = _curry(\$n, \$code);
*{\$package . '::' . *{\$symbol}{NAME}} = \$newsub;
}

sub foo :curry(3) {
print "foo: @_\n";
}

my \$x = foo(1,2);
&\$x(3);
&\$x(2);

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