[Haskell-cafe] Thoughts about currying and optimisations

Hello Café, An idea came to me: unless the compiler notices that stuffA and stuffB are equivalent, would it be correct to suppose that A is better than B? stuffA x = if someComputationallyExpensiveTest x then doSomething else doSomethingElse stuffB x y = if someComputationallyExpensiveTest x then doSomething y else doSomethingElse y I explain: in stuffA, the function only depends on x, so when doing: a = stuffA xxx runs the expensive test once and for all, and a can directly be bound to doSomething or doSomethingElse so calling after: a foo a bar won't run the test Whereas: b = stuffB xxx is valid due to curryfication, but: b foo b bar will both run the expensive test