Check if string is palindrome. More accurate implementation for http://www.toptal.com/javascript/interview-questions#iquestion-34

palindrome.js

// Also handles special characters and uppercase 
// like in “Amore, Roma“, “A man, a plan, a canal: Panama” or “No ‘x’ in ‘Nixon’“
// (Unfortunately doesn't fit into 80 chars)

function isPalindrome(str) {
  var stripped = str.toLowerCase().replace(/[^a-z]/g, '');
  return stripped === stripped.reverse();
}