phpjs/functions/strings/ucfirst.js

php.js offers community built php functions in javascript

function ucfirst(str) {
  //  discuss at: http://phpjs.org/functions/ucfirst/
  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Onno Marsman
  // improved by: Brett Zamir (http://brett-zamir.me)
  //   example 1: ucfirst('kevin van zonneveld');
  //   returns 1: 'Kevin van zonneveld'

  str += '';
  var f = str.charAt(0)
    .toUpperCase();
  return f + str.substr(1);
}