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Hmm, why a hash? And why not optimize assuming the current value is already in @seen? Also, declarators need not be separate statements. So I'd probably write it like this:
sub fib (Int $n) { return 1 if $n < 2; state @seen[$n] //= fib($n-1) + fib($n-2); }
I think that may be a little clearer as well. If I wanted to golf it just a bit more I'd say:
sub fib (Int $n) { $n < 2 or state @seen[$n] //= fib($n-1) + fib($n-2); }
If I wanted to golf it a lot more I'd say:
my&fib:={$_<2or state@s[$_]//=fib($_-1)+fib $_-2}

In reply to Re^3: How will you use state declared variables in Perl6? by TimToady
in thread How will you use state declared variables in Perl6? by Limbic~Region

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