Ruby Day 2

grep.rb

File.open("Ruby_Day_1.rb","r"){|file| file.each_line{|line| p line if line[/num_/]}}

Print array 4 elements each time.rb

Print array 4 elements each time
[*(1..16)].each { |v| v%4==0? p(v) : print("#{v},")} 

Print array 4 elements with each slice.rb

[*(1..16)].each_slice(4) {|v| p v} 

Tree.rb

class Tree
  attr_accessor :children, :node_name
  
  def initialize(t={})
     t.each do |k,v|
       @node_name=k
       @children=v.collect { |c| Tree.new(Hash[*c]) }
      end
  end
  
  def visit_all(&block)
    visit &block
    children.each {|c| c.visit_all &block}
  end
  
  def visit()
    yield self
  end

  private :visit
  
end 


ruby_tree=Tree.new({'grandpa'=>{'dad'=>{'child 1'=>{},'child 2'=>{}},'uncle'=>{'child 3'=>{},"child 4"=>{}}}})
pp "Visiting entire tree"
ruby_tree.visit_all {|node| pp node.node_name}