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

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Value is undefined	type	beginner	blog_images/peaches.jpg	2018-01-16T16:50:21+02:00	2020-10-20T23:02:01+03:00

Checks if the specified value is undefined.

• Use the strict equality operator to check if val is equal to undefined.

const isUndefined = val => val === undefined;

isUndefined(undefined); // true