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

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Collection is empty	snippet	javascript	type array object string	mountain-lake	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