Iterator in Ruby and Python

Unlike Java, both languages support real iterator not just iterator object. The following code shows how to create and use iterator in Python.

def from_1_to_5():
  for i in [1, 2, 3, 4, 5]:
    yield i

for num in from_1_to_5():
  print num

The following code shows how to make it in Ruby. Desides a style similar to Python, Ruby can use iterator with block.

def iterator
  for i in [1, 2, 3, 4, 5]
    yield(i)
  end 
end

# invoke iterator in a way similar to Python
call_block do |num|
  puts "#{num}"
end
  
# invoke iterator with the use of block 
call_block { |num| puts "#{num}" }