Update formatting

snippets/mapString.md

@@ -7,8 +7,8 @@ lastUpdated: 2020-10-21T21:54:53+03:00
 
 Creates a new string with the results of calling a provided function on every character in the given string.
 
-- Use `String.prototype.split('')` and `Array.prototype.map()` to call the provided function, `fn`, for each character in `str`.
-- Use `Array.prototype.join('')` to recombine the array of characters into a string.
+- Use `String.prototype.split()` and `Array.prototype.map()` to call the provided function, `fn`, for each character in `str`.
+- Use `Array.prototype.join()` to recombine the array of characters into a string.
 - The callback function, `fn`, takes three arguments (the current character, the index of the current character and the string `mapString` was called upon).
 
 ```js