enumerators.rb

>> e = Enumerator.new do |y|
?>   y << 1
>>   y << 2
>>   sleep 10
>>   y << 3
>> end
=> #<Enumerator: #<Enumerator::Generator:0x007ffcd3801100>:each>
>> puts Time.now; puts e.take(1).to_a; puts Time.now
2017-06-15 18:56:15 +1000
1
2017-06-15 18:56:15 +1000
=> nil
>> puts Time.now; puts e.take(2).to_a; puts Time.now
2017-06-15 18:56:19 +1000
1
2
2017-06-15 18:56:19 +1000
=> nil
>> puts Time.now; puts e.take(3).to_a; puts Time.now
2017-06-15 18:56:21 +1000
1
2
3
2017-06-15 18:56:31 +1000
=> nil
>>