Haskell Cookbook

How to do it...

1. Create a new project called working-with-monad-par with the simple stack template:

        stack new working-with-monad-par simple

2. Add a dependency on the monad-par library in the build-depends sub-section of the executable section. Also add -threaded -fprof-auto -rtsopts -eventlog to the ghc-options subsection:

  executable working-with-monad-par
    hs-source-dirs:      src
    main-is:             Main.hs
    ghc-options:         -threaded -fprof-auto -rtsopts -eventlog
    default-language:    Haskell2010
    build-depends:       base >= 4.7 && < 5
                       , monad-par

3. Open src/Main.hs. We will be adding our source here. After the Main module, add the relevant imports:

        module Main where

        import Control.Monad.Par
        import Data.Int

4. Write a simple fibonacci number calculator:

 fib ...