ucfirst and ucwords in JavaScript

String.prototype.ucfirst = function()
{
    return this.charAt(0).toUpperCase() + this.substr(1).toLocaleLowerCase();
}

String.prototype.ucwords = function()
{
    var arr = this.split(' ');
    arr.forEach(function(e, i, a){ a[i] = e.ucfirst(); });
    return arr.join(' ');
}