update snippets 1-15

snippets/chunk.md

@@ -9,5 +9,8 @@ If the original array can't be split evenly, the final chunk will contain the re
 ```js
 const chunk = (arr, size) =>
   Array.from({length: Math.ceil(arr.length / size)}, (v, i) => arr.slice(i * size, i * size + size));
-// chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],[5]]
+```
+
+```js
+chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],[5]]
 ```