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

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Collection is empty	type,array,object,string	beginner	blog_images/book-chair.jpg	2018-01-23T19:25:17+02:00	2020-10-20T23:02:01+03:00

Checks if the a value is an empty object/collection, has no enumerable properties or is any type that is not considered a collection.

• Check if the provided value is null or if its length is equal to 0.

const isEmpty = val => val == null || !(Object.keys(val) || val).length;

isEmpty([]); // true
isEmpty({}); // true
isEmpty(''); // true
isEmpty([1, 2]); // false
isEmpty({ a: 1, b: 2 }); // false
isEmpty('text'); // false
isEmpty(123); // true - type is not considered a collection
isEmpty(true); // true - type is not considered a collection