phpjs/functions/strings/ucfirst.js

php.js offers community built php functions in javascript

function ucfirst(str) {
  // From: http://phpjs.org/functions
  // +   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);
}