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domgetter/enumerator.rb Secret

Created March 26, 2017 20:31
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enumerator.rb
evens_upto_1000 = Enumerator.new do |y|
(0...1000).each do |n|
y << n if n.even?
end
end
evens_upto_1000.take(20)
# [0, 2, 4, 6, 8, ..., 36, 38]
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