Calculates the ranking of an array based on a comparator function.
- Use
Array.prototype.map()
andArray.prototype.filter()
to map each element to a rank using the provided comparator function.
代码实现
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]