added nor snippet

snippets/nor.md

@@ -0,0 +1,20 @@
+---
+title: nor
+tags: math,logic,beginner
+unlisted: true
+---
+
+Returns the logical nor of the given two values.
+
+- Use the logical not (`⬇`) operator to return the inverse of the logical-or the given two values.
+
+```js
+const nor = (a,b) => !(a||b);
+```
+
+```js
+nor(true,true); // false
+nor(true,false); // false
+nor(false,true); // false
+nor(false,false); // true
+```