The **permutation-parity** module provides a tiny Node.js function that determines the sign of a given permutation: it returns 1 for odd permutations, –1 for even ones, and 0 for invalid inputs. It’s aimed at JavaScript developers needing a fast, lightweight way to compute permutation parity in algorithms or mathematical code.
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Reuse typed arrays
tap-producing test harness for node and browsers
Ranks and unranks permutations
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mikolalysenko
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