28 lines
773 B
Markdown
28 lines
773 B
Markdown
---
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title: Collection is empty
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tags: type,array,object,string
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expertise: beginner
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cover: blog_images/book-chair.jpg
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firstSeen: 2018-01-23T19:25:17+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Checks if the a value is an empty object/collection, has no enumerable properties or is any type that is not considered a collection.
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- Check if the provided value is `null` or if its `length` is equal to `0`.
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```js
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const isEmpty = val => val == null || !(Object.keys(val) || val).length;
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```
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```js
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isEmpty([]); // true
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isEmpty({}); // true
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isEmpty(''); // true
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isEmpty([1, 2]); // false
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isEmpty({ a: 1, b: 2 }); // false
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isEmpty('text'); // false
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isEmpty(123); // true - type is not considered a collection
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isEmpty(true); // true - type is not considered a collection
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```
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