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mculp/gist:3827906

Created October 3, 2012 16:10
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gistfile1.rb
irb(main):001:0> directions = %w[DESC ASC]
=> ["DESC", "ASC"]
irb(main):002:0> directions.instance_eval { def toggle(direction); self - [direction]; end }
=> nil
irb(main):003:0> directions.toggle('ASC')
=> ["DESC"]
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