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

Compact

Use .filter() to filter falsey values. For example false, null, 0, "", undefined, and NaN are falsey.

const compact = (arr) => arr.filter( v => [0, null, false, '', undefined].indexOf(v) === -1 && v);
// compact([0, 1, false, 2, '', 3, 'a', 'e'*23, NaN, 's', 34]) -> [ 1, 2, 3, 'a', 's', 34 ]