Answer exercise 1 in hashes chapter
Answer exercise 2 in hashes chapter.
Answer exercise 3 in hashes chapter.
Answer exercise 4 in hashes chapter.
Answer exercise 5 in hashes chapter.
Type exercise 6 in hashes chapter.
Study intro to regex.
Study procs in More Stuff chapter.
Study procs with arguments in More Stuff chapter.
Study passing procs to methods in More Stuff chapter.