Kebab file names

snippets/is-undefined.md

@@ -0,0 +1,19 @@
+---
+title: Value is undefined
+tags: type
+cover: peaches
+firstSeen: 2018-01-16T16:50:21+02:00
+lastUpdated: 2020-10-20T23:02:01+03:00
+---
+
+Checks if the specified value is `undefined`.
+
+- Use the strict equality operator to check if `val` is equal to `undefined`.
+
+```js
+const isUndefined = val => val === undefined;
+```
+
+```js
+isUndefined(undefined); // true
+```