Function to return a given string but in reverse

reverse.js

// Bonfire: Reverse a String
// Author: @erictleung
// Challenge: http://www.freecodecamp.com/challenges/bonfire-reverse-a-string
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function reverseString(str) {
  return str.split("").reverse().join("");
}

reverseString("hello");