If using ES6, use template litorals

Probably being pernickety.  But if we're using ES6, you could just use a template litoral instead of string concat? Not sure if the litoral version is a bit more difficult to read mind you.

snippets/digitize.md

@@ -6,7 +6,7 @@ Convert the number to a string, using spread operators in ES6(`[...string]`) bui
 Use `Array.map()` and `parseInt()` to transform each value to an integer.
 
 ```js
-const digitize = n => [...('' + n)].map(i => parseInt(i));
+const digitize = n => [...(`${n}`)].map(i => parseInt(i));
 ```
 
 ```js