Capitalize test uppercase() vs fromCharCode()

test.capitalize.js

function capitalize(str) {
   return str.substr(0, 1).toUpperCase() + str.substr(1)
}

function capitalize2(str) {
  return str.replace(/^[a-zàáâãäåçèéêëìíîïðòóôõöùúûüýÿñ]/, function(x) {
    return x.toUpperCase();
  });
}
 
var s = "àáâãäåçèéêëìíîïðòóôõöùúûüýÿñ".split('')
  , S = s.map( function(letter){
    var l1 = capitalize(letter)
      , l2 = capitalize2(letter);
    console.log(letter, l1, l2, l1 === l2);
    return letter;
  });