object-property

Let's say we have two classes named People and Disease . These classes are related by the Object Property has . :People :has :Disease People has subclass (or individual) John , and Disease has subclass (or individual) Cancer . :John a :People :Cancer a :Disease How can we get the relationship between these subclasses by inference? :John :has :Cancer Before you can get to an answer, there are a number of misconceptions you'll need to resolve. First, subclass and individual are very different concepts. Individuals (instances) are members of classes. Subclass denotes a class is a subset of

Possible Duplicate: How do I test for an empty Javascript object from JSON? Is there an easy way to check if an object has no properties, in Javascript? Or in other words, an easy way to check if a map/associative array is empty? For example, let's say you had the following: var nothingHere = {}; var somethingHere = {foo: "bar"}; Is there an easy way to tell which one is "empty"? The only thing I can think of is something like this: function isEmpty(map) { var empty = true; for(var key in map) { empty = false; break; } return empty; } Is there a better way (like a native property/function or