Some from Raku (formerly Perl 6) that I really like: * sub MAIN: sub MAIN(Int $x, :$verbose) { } generates a command line parser that expects an Integer plus

Some from Raku (formerly Perl 6) that I really like: * sub MAIN: sub MAIN(Int $x, :$verbose) { } generates a command line parser that expects an Integer plus an optional named switch --verbose * It has named params (as seen above), and there are abbreviations: instead of thing => $thing you can write :$thing to avoid duplicating the name (:thing also exists, though it create a pair "thing" => True, so ruby lovers need to be careful :D ) * junctions for quick conditionals/validation: 0 <= all($x, $y, $z) <= 2 * pi * this is a probably debatable, but: if you use a * as a term, it will create a lambda for you, so *+2 is similar to sub ($x) { $x + 2 }