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

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
Argument coalescing	type,beginner	2017-12-17T10:08:55+02:00	2020-09-15T16:28:04+03:00

Returns the first defined, non-null argument.

• Use Array.prototype.find() and Array.prototype.includes() to find the first value that is not equal to undefined or null.

const coalesce = (...args) => args.find(v => ![undefined, null].includes(v));

coalesce(null, undefined, '', NaN, 'Waldo'); // ''