Are there something like Python generators in Ruby?

Question

I am new to Ruby, is there a way to yield values from Ruby functions? If yes, how? If not, what are my options to write lazy code?

Answer 1

Ruby supports generators out of the box using Enumerable::Generator:

require 'generator'

# Generator from an Enumerable object
g = Generator.new(['A', 'B', 'C', 'Z'])

while g.next?
  puts g.next
end

# Generator from a block
g = Generator.new { |g|
  for i in 'A'..'C'
    g.yield i
  end

  g.yield 'Z'
}

# The same result as above
while g.next?
  puts g.next
end

https://ruby-doc.org/stdlib-1.8.7/libdoc/generator/rdoc/Generator.html