Haskell has some problems that mean it is not suited to a lot of tasks, esp. the difficulty of predicting space/time performance and integration with OS-level f

Haskell has some problems that mean it is not suited to a lot of tasks, esp. the difficulty of predicting space/time performance and integration with OS-level facilities. But it is a serious contender in many cases where correctness is essential: Haskell's type system is expressive and the language makes valuable promises about how code behaves.