Filters out the non-unique values in an array, based on a provided comparator function.
Use Array.prototype.filter()
and Array.prototype.every()
for an array containing only the unique values, based on the comparator function, fn
.
The comparator function takes four arguments: the values of the two elements being compared and their indexes.
代码片段
const filterNonUniqueBy = (arr, fn) =>
arr.filter((v, i) => arr.every((x, j) => (i === j) === fn(v, x, i, j)));
使用样例
filterNonUniqueBy(
[
{ id: 0, value: 'a' },
{ id: 1, value: 'b' },
{ id: 2, value: 'c' },
{ id: 1, value: 'd' },
{ id: 0, value: 'e' }
],
(a, b) => a.id == b.id
); // [ { id: 2, value: 'c' } ]