Rename js snippets

snippets/js/s/collection-is-empty.md

@@ -0,0 +1,27 @@
+---
+title: Collection is empty
+type: snippet
+language: javascript
+tags: [type,array,object,string]
+cover: mountain-lake
+dateModified: 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`.
+
+```js
+const isEmpty = val => val == null || !(Object.keys(val) || val).length;
+```
+
+```js
+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
+```