hiboma https://blog.hatena.ne.jp/hiboma/ hibomaの日記 https://hiboma.hatenadiary.jp/ Perl memo メモ sub cons { #construct Pair Data my ($x, $y) = @_; return sub { my $m = shift; #dispatch if ( $m == 0) { return $x; }elsif ($m == 1) { return $y; } }; } sub car { #$z must be Pair Data my $z = shift; $z->(0); } sub cdr { my $z = shift; $z->(1); } my $pair = cons('a' ,'b'); print car($pair); # a pr… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhiboma.hatenadiary.jp%2Fentry%2F20061208%2F1165570239" title=" - hibomaの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2006-12-08 18:30:39 rich https://hiboma.hatenadiary.jp/entry/20061208/1165570239 1.0 100%