update snippets 62-78

snippets/isArray.md

@@ -6,6 +6,9 @@ Use `Array.isArray()` to check if a value is classified as an array.
 
 ```js
 const isArray = val => !!val && Array.isArray(val);
-// isArray(null) -> false
-// isArray([1]) -> true
+```
+
+```js
+isArray(null) -> false
+isArray([1]) -> true
 ```