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April 8, 2017 21:14
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| def users_with_discounts | |
| @users_with_discounts ||= {} | |
| if @users_with_discounts.has_key?(:return_value) | |
| @users_with_discounts[:return_value] | |
| else | |
| @users_with_discounts[:return_value] = computation_that_returns_nil | |
| end | |
| end |
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