Sometimes you just want to evaluate a string
λ :set -XOverloadedStrings
λ import Language.Eval
λ eval "1+1" []
2
λ eval "a+b" [2,3]
5
λ eval "a+b * 100" [2,3]
302
λ eval "a+b * 100 & 0xf" [2,3]
14
There's an example app included:
Eval "1000 & 0xff"
People say that it's okay that Haskell has no eval function because it's
easy to write your own. But why bother? Use mine.