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

title, tags, expertise, author, cover, firstSeen

title	tags	expertise	author	cover	firstSeen
Compact and join array	array	intermediate	chalarangelo	blog_images/racoon.jpg	2022-04-08T05:00:00-04:00

Removes falsy values from an array and combines the remaining values into a string.

• Use Array.prototype.filter() to filter out falsy values (false, null, 0, "", undefined, and NaN).
• Use Array.prototype.join() to join the remaining values into a string.

const compactJoin = (arr, delim = ',') => arr.filter(Boolean).join(delim);

compactJoin(['a', '', 'b', 'c']); // 'a,b,c'