como usar o differenceWith no javascript es6

January 04, 2020

Filters out all values from an array for which the comparator function does not return true.

Use Array.prototype.filter() and Array.prototype.findIndex() to find the appropriate values.

const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);

differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b)); // [1, 1.2]