Array ranking

Angelos Chalaris · JavaScript, Array, Math · Apr 13, 2022

Calculates the ranking of an array based on a comparator function.

  • Use Array.prototype.map() and Array.prototype.filter() to map each element to a rank using the provided comparator function.
const ranking = (arr, compFn) =>
  arr.map(a => arr.filter(b => compFn(a, b)).length + 1);
ranking([8, 6, 9, 5], (a, b) => a < b);
// [2, 3, 1, 4]
ranking(['c', 'a', 'b', 'd'], (a, b) => a.localeCompare(b) > 0);
// [3, 1, 2, 4]

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