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Left factorials: Difference between revisions
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→{{header|Perl}}: Mention >100x speedup using Math::GMP
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=={{header|Perl}}==
By caching the last used factorial and left factorial values, I avoid needless recomputation. By only retaining the most recently used values, instead of all past values, I avoid the need to store twenty thousand enormous numbers.
If performance is a concern, this will run over 100x faster by replacing the line "use bigint" with "use Math::GMP qw/:constant/" (after installing that module).
<lang perl>#!perl
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