Rails Crash Course

Appendix A. Solutions

Chapter 1

1. Exercise 1 is about learning to read a file and exploring the array methods using the contents of the file. I’d expect to see something like this in the console after completing the exercise:

   irb(main):001:0> file = File.read("test.txt")
    => "Call me Ishmael..."
   irb(main):002:0> puts file.split
   Call
   me
   Ishmael
   --snip--
    => nil
   irb(main):003:0> puts file.split.length
    => 198
   irb(main):004:0> puts file.split.uniq.length
    => 140

   The output depends on the text you used.

2. The second exercise requires writing a little code. The following sample solves the problem using only methods covered so far:

   file = File.read("test.txt") counts = {} file.split.each do |word| if counts[word] counts[word] = counts[word] + 1 else counts[word] ...