AngularJs Filter | Variable number of decimal (currency option)

angular.module('app').filter('floatdigit', function(){
  return function(value, showsymbol) {
    var number = parseFloat(value);
    var symbol = (typeof showsymbol != "undefined" && showsymbol) ? ' €' : '';

    if (parseFloat(number.toFixed(2)) === parseFloat(number.toFixed(3))) return number.toFixed(2)+symbol;
    return number.toFixed(3)+symbol;
  };
});