Here you can find the source of ucfirst()
String.prototype.ucfirst = function() { return this.charAt(0) + this.slice(1); }
String.prototype.ucFirst = function() { return [this.charAt(0).toUpper(), this.slice(1)].join(''); };
String.prototype.ucFirst = function() { return this.charAt(0).toUpperCase() + this.slice(1);
String.prototype.ucFirst = function(){ return this.replace(/^\w/, function(x){ return x.toUpperCase(); })
String.prototype.uc_first = function() { return this.charAt(0).toUpperCase() + this.slice(1); };
String.prototype.ucfirst = function () { return this.charAt(0).toUpperCase() + this.slice(1); };
String.prototype.ucfirst = function() { return this.charAt(0).toUpperCase() + this.slice(1);
String.prototype.ucfirst = function() return this.charAt(0).toUpperCase() + this.substr(1); };
String.prototype.ucfirst = function() { return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
String.prototype.ucfirst=function(){ var split=this.split(''); split[0]=split[0].toUpperCase(); return split.join(''); };