update snippets 62-78

snippets/isFunction.md

@@ -6,6 +6,9 @@ Use `typeof` to check if a value is classified as a function primitive.
 
 ```js
 const isFunction = val => val && typeof val === 'function';
-// isFunction('x') -> false
-// isFunction(x => x) -> true
+```
+
+```js
+isFunction('x') -> false
+isFunction(x => x) -> true
 ```