Nest all content into snippets

snippets/js/s/is-null.md

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+---
+title: Value is null
+type: snippet
+language: javascript
+tags: [type]
+cover: broken-screen
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+Checks if the specified value is `null`.
+
+- Use the strict equality operator to check if the value of `val` is equal to `null`.
+
+```js
+const isNull = val => val === null;
+```
+
+```js
+isNull(null); // true
+```