How bad is this:
addProduct :: [Product] -> Product -> [Product]
addProduct inventory product = nub (product : inventory)
compared to this:
addProduct :: [Product] -> Product -> [Product]
addProduct inventory p
| isNothing (find (==p) inventory) = p : inventory
| otherwise = inventory
My guess is that the latter is more efficient, but then when I think
about laziness, I wonder whether the first is a fair trade.
Michael
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