Ruby by Example

Chapter Recap

What was new in this chapter?

• Making new predicates for explicit Boolean casting

• Method aliases

• Superclasses

• Metaprogramming

• The Symbol class

• Arrays and the join method

• The protected level of access control

• The dup and pop methods

• Making command-line interface flags

• Library files for reusable code

• Class constants

• The Hash class

• Hash keys and values

• The here doc declaration

• Newline characters within Strings

• Using Array.include? to test for membership

• The any? predicate

• The Hash.keys method

• A bit on Ruby1.8 vs. Ruby1.6 and the any? predicate

• Palindromes and reversing Strings

• Extracting the letters from Strings

• Changing the case of Strings

That’s even more than the last chapter, which was hardly holding your hand. Congratulations again. Let’s move on to some ...