At the end x equals to 151,200. The first time the block executes, the value of increment is 5, the next time 6, and so on, until the last time it is 10. Each piece of data is an instance of one of these classes. A literal can be used to explicitly define data. A literal can be a number, a string, a character, a symbol, or an array of literals.
All variables initially point to the object nil .
This value is an instance of a class called UndefinedObject . The values true and false are provided by the classes True and False . It is possible to define code as an instance of a class called Block . Most variables are named instance variables and point to objects. They do not contain the actual objects.