Nest all content into snippets

snippets/js/s/is-symbol.md

@@ -0,0 +1,20 @@
+---
+title: Value is symbol
+type: snippet
+language: javascript
+tags: [type]
+cover: naming-conventions
+dateModified: 2020-09-15T16:28:04+03:00
+---
+
+Checks if the given argument is a symbol.
+
+- Use `typeof` to check if a value is classified as a symbol primitive.
+
+```js
+const isSymbol = val => typeof val === 'symbol';
+```
+
+```js
+isSymbol(Symbol('x')); // true
+```