7l7w ruby day2

# Print the content of an array of sicteen numbers, four numbers at a time, using just each
array = []
(1..16).to_a.each { |item|
  array << item
  if (array.length == 4)
    p ar
    ar = []
  end
}

# Same with each_slice in Enumerable
(1..16).to_a.each_slice(4) { |item| p item }

# 2. Change the UI of the Tree class to accept a hash for configuration
#
# Download Tree code here: http://pragprog.com/titles/btlang/source_code
# Change to initialize method of the original code

def initialize(hash)
  @children = []
  hash.each_pair { |name, children|
    @node_name = name
    if !children.empty?
      children.each_pair { |child_name, children_nodes|
        new_hash = {child_name => children_nodes}
        @children << Tree.new(new_hash)
      }
    end
  }
end

# ...and call of the new UI :)

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

# 3. Grep the lines of a file matching a simple regular expression (/tree/) with line number

File.open("tree.rb").each_with_index { |line, index|
  if line =~ /tree/
    p "##{index+1} #{line}"
  end
}