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nagachika/example_lazy_flat_map.rb

Created March 9, 2012 06:59
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example of Enumerable::Lazy#flat_map
Raw
example_lazy_flat_map.rb
ary = (0..10).to_a
o = Object.new
o.instance_variable_set(:@ary, ary)
def o.to_ary
@ary
end
l = [o].lazy.flat_map{|x| x}
p l.next # => 0
ary.clear
p l.next # => iteration reached an end (StopIteration)
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