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Raku (programming language)
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===Tower of Hanoi=== [[Tower of Hanoi]] is often used to introduce recursive programming in computer science. This implementation uses Raku's multi-dispatch mechanism and parametric constraints: <syntaxhighlight lang="raku"> multi sub hanoi(0, $, $, $) { } # No disk, so do not do anything multi sub hanoi($n, $a = 'A', $b = 'B', $c = 'C') { # Start with $n disks and three pegs A, B, C hanoi $n - 1, $a, $c, $b; # firstly move top $n - 1 disks from A to B say "Move disk $n from peg $a to peg $c"; # then move last disk from A to C hanoi $n - 1, $b, $a, $c; # lastly move $n - 1 disks from B to C } </syntaxhighlight>
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