Web Reference: To check if a property on a given object exists or not, you can use the .hasOwnProperty() method. someObject.hasOwnProperty(someProperty) returns true or false depending on if the property is found on the object or not. If what you're looking for is if an object has a property on it that is iterable (when you iterate over the properties of the object, it will appear) then doing: prop in object will give you your desired effect. Sometimes it is useful to check if the property of a given object exists or not. We can use the .hasOwnProperty(propname) method of objects to determine if that object has the given property name. .hasOwnProperty() returns true or false if the property is found or not.
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