Prepare repository for merge

javascript/snippets/is-boolean.md

@@ -0,0 +1,20 @@
+---
+title: Value is boolean
+type: snippet
+tags: [type]
+cover: book-stopper
+dateModified: 2020-09-15T16:28:04+03:00
+---
+
+Checks if the given argument is a native boolean element.
+
+- Use `typeof` to check if a value is classified as a boolean primitive.
+
+```js
+const isBoolean = val => typeof val === 'boolean';
+```
+
+```js
+isBoolean(null); // false
+isBoolean(false); // true
+```