What is the Reader Monad in Haskell?

Can you explain what the Reader Monad is in Haskell?

The Reader Monad is a design pattern in Haskell that allows you to pass read-only shared state through a computation.

How does it differ from other monads?

Unlike other monads, the Reader Monad focuses on dependency injection, allowing functions to access shared environment without explicit parameters.

Can you give me a simple example of using the Reader Monad?

Sure! Here's a simple example: import Control.Monad.Reader and then define a function like greet :: String -> Reader String String that uses the Reader to access a name.

What are the benefits of using the Reader Monad?

The benefits include cleaner code, easier testing, and better separation of concerns by avoiding global state.