30-seconds-of-code/differenceWith.md at ec38d84eec9e8c81ca05d49ea8ed3af6f2a23e43

Files

Chao f3f1daede9 Update differenceWith.md

use Array.findIndex() instead of Array.find()

2018-01-04 11:37:10 +08:00

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

Use Array.filter() and Array.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]