// More exact variable type is possible only by prototype toString method:
var realTypeOf = function (object) {
	// typeStr is always in form: '[object MoreSpecificName]'
	var typeStr = {}.toString.apply(object);
	// let's return only the last part 'MoreSpecificName'
	var result = typeStr.substr(8, typeStr.length - 9);
	if (result == "Number") {
		if (!isFinite(object)) {
			result += ".Inifinite";
		} else if (isNaN(object)) {
			result += ".NaN";
		} else if (object.toString.indexOf('.') > -1) { // Math.round(object) !== object
			result += ".Float";
		} else {
			result += ".Int";
		}
	}
	return result;
};

// now is returning type much better:
console.log(
    realTypeOf({}),         // Object
    realTypeOf(1),			// Number.Int
    realTypeOf(.5),			// Number.Float
    realTypeOf(NaN),		// Number.NaN
    realTypeOf(Infinity),	// Number.Inifinite
    realTypeOf(""),			// String
    realTypeOf(false),		// Boolean
    realTypeOf([]),			// Array
    realTypeOf(new Date()),	// Date
    realTypeOf(null),		// Null
    realTypeOf(undefined),	// Undefined
    realTypeOf(function(){})// Function
);