What was new in this chapter?
End-of-line differences among operating systems
Regular expressions, including the
Multiplication of Arrays
Regular expressions with the
Objects as the results of blocks
Calling successive methods on the output of methods (“chaining” methods)
Using new methods of Open Classes in quick scripts
Multiplication of Strings
The Range class
That’s quite a bit, including some important new functional concepts like recursion and a few very handy functional methods. You’ll need these concepts as we move on. Let’s proceed to some more complex treatment of numbers in Chapter 5.