#!perl
use warnings FATAL => 'all';
use strict;
use Test::More tests => 26;
use Function::Parameters qw(:strict);
fun foo_r($depth, $fst, $snd) {
return [$fst, $snd, $snd - $fst] if $depth <= 0;
$fst++;
my $thd = foo_r $depth - 1, $fst + $snd, $fst * $snd;
$snd++;
return [$fst, $snd, $thd];
}
fun foo_o($depth, $fst = 1, $snd = 2) {
return [$fst, $snd, $snd - $fst] if $depth <= 0;
$fst++;
my $thd = foo_o $depth - 1, $fst + $snd, $fst * $snd;
$snd++;
return [$fst, $snd, $thd];
}
fun foo_nr(:$depth, :$fst, :$snd) {
return [$fst, $snd, $snd - $fst] if $depth <= 0;
$fst++;
my $thd = foo_nr snd => $fst * $snd, depth => $depth - 1, fst => $fst + $snd;
$snd++;
return [$fst, $snd, $thd];
}
fun foo_no(:$depth, :$fst = 1, :$snd = 2) {
return [$fst, $snd, $snd - $fst] if $depth <= 0;
$fst++;
my $thd = foo_no snd => $fst * $snd, depth => $depth - 1, fst => $fst + $snd;
$snd++;
return [$fst, $snd, $thd];
}
for my $f (
\&foo_r, \&foo_o,
map { my $f = $_; fun ($d, $x, $y) { $f->(depth => $d, snd => $y, fst => $x) } }
\&foo_nr, \&foo_no
) {
is_deeply $f->(0, 3, 5), [3, 5, 2];
is_deeply $f->(1, 3, 5), [4, 6, [9, 20, 11]];
is_deeply $f->(2, 3, 5), [4, 6, [10, 21, [30, 200, 170]]];
}
fun slurpy(:$n, %rest) { [$n, \%rest] }
{
is_deeply slurpy(a => 1, b => 2, n => 9), [9, {a => 1, b => 2}];
my $sav1 = slurpy(n => 5);
is_deeply $sav1, [5, {}];
my $sav2 = slurpy(n => 6, a => 3);
is_deeply $sav2, [6, {a => 3}];
is_deeply $sav1, [5, {}];
is_deeply slurpy(b => 4, n => 7, hello => "world"), [7, {hello => "world", b => 4}];
is_deeply $sav1, [5, {}];
is_deeply $sav2, [6, {a => 3}];
}
{
{
package TimelyDestruction;
method new($class: $f) {
bless {on_destroy => $f}, $class
}
method DESTROY {
$self->{on_destroy}();
}
}
use Function::Parameters; # lax
fun bar(:$n) { defined $n ? $n + 1 : "nope" }
is bar(n => undef), "nope";
is bar(n => 2), 3;
is bar, "nope";
my $dead = 0;
{
my $o = TimelyDestruction->new(fun () { $dead++ });
is bar(n => $o), $o + 1, "this juice is bangin yo";
}
is $dead, 1;
$dead = 999;
is bar(n => 3), 4;
is $dead, 999;
}