update snippets 62-78

snippets/isNumber.md

@@ -6,6 +6,9 @@ Use `typeof` to check if a value is classified as a number primitive.
 
 ```js
 const isNumber = val => typeof val === 'number';
-// isNumber('1') -> false
-// isNumber(1) -> true
 ```
+
+```js
+isNumber('1') -> false
+isNumber(1) -> true
+```