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Ruby Sequence
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| irb(main):001:0> a = Enumerator.new { |output| i = 0; loop { output << i = i.next } } | |
| => #<Enumerator: #<Enumerator::Generator:0x007f8014012818>:each> | |
| irb(main):002:0> a.next | |
| => 1 | |
| irb(main):003:0> a.next | |
| => 2 | |
| irb(main):004:0> a.next | |
| => 3 |
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