- Computation type:
- Computations which read values from a shared environment.
- Binding strategy:
- Monad values are functions from the environment to a value.
The bound function is applied to the bound value, and both have access
to the shared environment.
- Useful for:
- Maintaining variable bindings, or other shared environment.
- Zero and plus:
- Example type:
- Reader [(String,Value)] a
The Reader monad (also called the Environment monad).
Represents a computation, which can read values from
a shared environment, pass values from function to function,
and execute sub-computations in a modified environment.
Using Reader monad for such computations is often clearer and easier
than using the Control.Monad.State.State monad.
Inspired by the paper
/Functional Programming with Overloading and
Mark P Jones (http://web.cecs.pdx.edu/~mpj/)
Advanced School of Functional Programming, 1995.