30-seconds-of-code/snippets/reject.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Reject non-matching values	array	blog_images/interior-7.jpg	2018-04-27T03:17:15+03:00	2020-10-22T20:24:04+03:00

Filters an array's values based on a predicate function, returning only values for which the predicate function returns false.

• Use Array.prototype.filter() in combination with the predicate function, pred, to return only the values for which it returns false.

const reject = (pred, array) => array.filter((...args) => !pred(...args));

reject(x => x % 2 === 0, [1, 2, 3, 4, 5]); // [1, 3, 5]
reject(word => word.length > 4, ['Apple', 'Pear', 'Kiwi', 'Banana']);
// ['Pear', 'Kiwi']