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deque-blog/MoneyKentBeckEvalExample.hs

Last active August 14, 2017 16:00
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MoneyKentBeckEvalExample.hs
-- Successful evaluation
evalMoneyIn findRate moneyExpr "USD"
> Just (Money {amount = 100.0, currency = "USD"})
-- Failing evaluation
evalMoneyIn findRate moneyExpr "USD"
> Nothing
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