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iso2022jp/ranks.js

Created July 6, 2021 15:39
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Compute ranks
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ranks.js
const ranks = (values, comparator = (a, b) => b - a) => values
.map((value, i) => [value, i])
.slice().sort(([a], [b]) => comparator(a, b))
.reduce((ranks, [value, i], rank, ordered) => [
...ranks.slice(0, i),
rank && !comparator(value, ordered[rank - 1][0]) ? ranks[ordered[rank - 1][1]] : rank + 1,
...ranks.slice(i + 1),
], Array.from({length: values.length}))
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