Ruby

day3_csv_application.rb

module ActsAsCsv
  class Row < Array
    def initialize(ary, headings)
      super(ary)
      @headings = headings
    end

    def method_missing(name, *args)
      idx = @headings.index name.to_s
      self[idx] if idx != nil
    end
  end

  def read
    @csv_contents = []
    filename = self.class.to_s.downcase + '.txt'
    file = File.new(filename)
    @headers = file.gets.chomp.split(', ')

    file.each do |row|
      @csv_contents << row.chomp.split(', ')
    end
  end

  attr_accessor :headers, :csv_contents
  def initialize
    read
  end

  def each(&block)
    csv_contents.each do |row|
      block.call Row.new(row, @headers)
    end
  end
end

class RubyCsv  # no inheritance! You can mix it in
  include ActsAsCsv
end

m = RubyCsv.new
puts m.headers.inspect
puts m.csv_contents.inspect
m.each do |row|
  print row.one, row.two
  print row.three
end

ruby_day1.rb

num = rand 10

while true
    print "Guess the number: "
    guess = gets.to_i
    if guess < num
        print "Too low!\n"
    elsif guess > num
        print "Too high!\n"
    else
        print "Yay! You got it right!\n"
        break
    end
end

ruby_day2_grep.rb

def grep(fn, re)
    File.open(fn) do |f|
        f.each do |l|
            print "#{f.lineno}: #{l}" if re.match l
        end
    end
end

grep('day2_grep.rb', /do/)

ruby_day2_tree.rb

class Tree
    attr_accessor :name, :children
    def initialize(hier)
        hier.each do |k, v|
            @name = k
            @children = v.map do |ch, desc|
                Tree.new(ch => desc)
            end
        end
    end

    def visit_one(&block)
        block.call self
    end

    def visit(&block)
        visit_one &block
        children.each do |c|
            c.visit &block
        end
    end
end

tree = Tree.new('grandpa' => {
    'dad' => {'child 1' => {}, 'child 2' => {} },
    'uncle' => {'child 3' => {}, 'child 4' => {} }
})


tree.visit do |node|
    p node.name
end

whats the number going to be in ruby_day1.rb