Added samples

snippets/capitalize-first-letter-of-every-word.md

@@ -4,4 +4,5 @@ Use `replace()` to match the first character of each word and `toUpperCase()` to
 
 ```js
 const capitalizeEveryWord = str => str.replace(/\b[a-z]/g, char => char.toUpperCase());
+// capitalizeEveryWord('hello world!') -> 'Hello World!'
 ```