Portability | portable |
---|---|

Stability | experimental |

Maintainer | libraries@haskell.org |

State monads, passing an updateable state through a computation.

Some computations may not require the full power of state transformers:

- For a read-only state, see Control.Monad.Trans.Reader.
- To accumulate a value without using it on the way, see Control.Monad.Trans.Writer.

This version is lazy; for a strict version, see Control.Monad.Trans.State.Strict, which has the same interface.