[1,2,3,4,5].each do |e| #do starts the block
  puts e
end #end ends it

$.each([1,2,3,4,5], function(e) { //Anonymous *function* starts here
  console.log(e);
}); //Ends here

class Array
  def my_each
    i = 0
    while(i<self.length)
      yield self[i]
      i+=1
    end
  end
end

def foo(&block)
end

def Proc.new(&block)
  block
end