7 Languages in 7 Weeks: Day 2

1-each.rb

(1..16).to_a.each {|i| i % 4==0 ? puts(i) : print(i) }

2-each_slice.rb

(1..16).to_a.each_slice(4) {|i| p i}

3-Family-Tree.rb

class Tree
  attr_accessor :children, :node_name

  def initialize(hash)
      @node_name = hash.keys.first
      @children = hash[@node_name].collect{|k,v| Tree.new({k=>v})}
  end

  def visit_all(&block)
    visit &block
    children.each {|c| c.visit_all &block}
  end

  def visit(&block)
    block.call self
  end
end

family = {'grandpa'=>{'dad'=> {'child 1'=>{}, 'child 2'=>{}},'uncle'=>{'child 3'=>{}, 'child 4' =>{}}}}

family_tree  = Tree.new(family)
family_tree.visit_all {|c| puts c.node_name }

4-grep.rb

def my_grep(file, phrase)
  puts File.open(file).each_line.grep /.*#{phrase}.*/
end

my_grep('C:\Test\test.txt', 'ruby')

Nice - especially the grep solution - I had no idea that was possible.