in reply to Re^2: Perl Number range lookup question
in thread Perl Number range lookup question
my $tier = $tiers{$n} //= calculate_tier($n);
That's a rather elegant memoization technique for functions in general (provided the function parameters can't be references). If your function took two parameters, you could even do:
my $tier = $tiers{$n, $m} //= calculate_tier($n, $m);
... taking advantage of Perl's rarely used multi-dimensional array fakery.
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