runWriter

runWriter :: Writer w a -> (a, w)
transformers Control.Monad.Trans.Writer.Lazy, transformers Control.Monad.Trans.Writer.Strict, mtl Control.Monad.Writer.Lazy, mtl Control.Monad.Writer.Strict
Unwrap a writer computation as a (result, output) pair. (The inverse of writer.)
runWriterT :: WriterT w a -> m (a, w)
mtl Control.Monad.Writer.Lazy, mtl Control.Monad.Writer.Strict
runWriterT :: WriterT w m a -> m (a, w)
transformers Control.Monad.Trans.Writer.Lazy, transformers Control.Monad.Trans.Writer.Strict