This includes the inherited properties. If you try to add a property name that is already defined on the object you will get an error message. In fact, it's a good idea to limit property names to letters, numbers and underscores. The default initial value for properties is the integer 0. In addition to properties, objects also have verbs.
Verbs are the executable code associated with objects and which define how the object behaves.
Some people distinguish between the two by calling the verbs that can only be used from the commandline, 'commands' and calling all the others 'verbs'. Let's start with the command line. To invoke a verb from the command line you type the name of the verb and sometimes follow it with a set of words which are the arguments. Data Types, Variables and Control Structures 5. A Simple Example Verb 6.