update snippets 32-47

snippets/fibonacci.md

@@ -8,5 +8,8 @@ Use `Array.reduce()` to add values into the array, using the sum of the last two
 ```js
 const fibonacci = n =>
   Array.from({ length: n}).reduce((acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i), []);
-// fibonacci(5) -> [0,1,1,2,3]
+```
+
+```js
+factorial(6) -> 720
 ```