30-seconds-of-code/snippets/js/s/is-undefined.md

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Value is undefined	snippet	javascript	type	peaches	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