367 B
367 B
title, tags, expertise, firstSeen, lastUpdated
| title | tags | expertise | firstSeen | lastUpdated |
|---|---|---|---|---|
| Value is undefined | type | beginner | 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
valis equal toundefined.
const isUndefined = val => val === undefined;
isUndefined(undefined); // true