Add logical not

snippets/not.md

@@ -0,0 +1,17 @@
+---
+title: not
+tags: math,logic,beginner
+---
+
+Returns the logical inverse of the given value.
+
+Use the logical not (`!`) operator to return the inverse of the given value.
+
+```js
+const not = a => !a;
+```
+
+```js
+not(true); // false
+not(false); // true
+```