evenodd.rb

def odd(list)
  list.each_with_index do |item, index|
    yield item if index % 2 == 0
  end
end

def even(list)
  list.each_with_index do |item, index|
    yield item if index % 2 == 1
  end
end

def more_than_3(list)
  list.select {|item| item > 3 }
end

even([1,2,3,4,5]) {|item| puts item }
odd([1,2,3,4,5]) {|item| puts item }