revealing module in javascript

revealing module pattern

ProjectNamespace.Helpers.Converters = (function() {
  var convertToDate, convertToFloat, convertToInteger, isValidDate;
  isValidDate = function(d) {
    if (Object.prototype.toString.call(d) === "[object Date]") {
      return !isNaN(d.getTime());
    }
    return false;
  };
  convertToDate = function(input) {
    var d;
    d = new Date(input);
    if (isValidDate(d)) return d;
  };
  convertToInteger = function(value) {
    return parseInt(value) || null;
  };
  convertToFloat = function(value) {
    return parseFloat(value) || null;
  };
  return {
    convertToDate: convertToDate,
    convertToInteger: convertToInteger,
    convertToFloat: convertToFloat
  };
})();