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Haskell in 5 steps

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We can compile this to produce a standalone executable. In the file
We can compile this to produce a standalone executable. In the file
'''fac.hs''' write (using elegant pattern matching instead of
'''fac.hs''' write, using elegant pattern matching instead of
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$ ghc -o fac fac.hs
$ ghc -o fac fac.hs
$ ./fac
$ ./fac

Revision as of 08:08, 20 September 2006

Haskell is a general purpose, purely functional programming language. This page will help you get started as quickly as possible.


1 Install Haskell

Haskell, like most other languages, comes in two flavors: batch oriented (compiler) and interactive (interpreter). An interactive system gives you a command line where you can experiment and evaluate expressions directly, and is probably a good choice to start with.

GHC Compiler and interpreter (GHCi) Probably the most feature-complete system
Hugs Interpreter only Very portable, and more lightweight than GHC.

While both GHC and Hugs work on Windows, Hugs has perhaps the best integration on that platform. There is also information available on installing Haskell software on Mac OS X.

2 Start Haskell

Open a terminal. If you installed GHC type ghci (the GHC interpreter). If you installed Hugs type hugs.

    $ ghci
       ___         ___ _
      / _ \ /\  /\/ __(_)
     / /_\// /_/ / /  | |      GHC Interactive, version 6.4, for Haskell 98.
    / /_\\/ __  / /___| |
    \____/\/ /_/\____/|_|      Type :? for help.

    Loading package base-1.0 ... linking ... done.

And you are presented with a prompt. The Haskell system now attentively awaits your input.

3 Write your first Haskell program

If you've learned to program another language, your first program probably was "Hello, world!", so let's do that:

Prelude> "Hello, World!"
"Hello, World!"

The Haskell system evaluated the string, and printed the result. Or we can try a variation to print directly to standard output:

Prelude> putStrLn "Hello World"
Hello World

Using a Haskell compiler, such as GHC, you can compile the code to a standalone executable. Create a source file hello.hs containing:

main = putStrLn "Hello, World!"

And compile it with:

    $ ghc -o hello hello.hs

You can then run the executable (./hello on Unix systems, hello.exe on Windows):

    $ ./hello
    Hello, World!

4 Haskell the calculator

Let's do something fun. In Haskell, your first true program is the factorial function. So back to the interpreter now and let's define it:

Prelude> let fac n = if n == 0 then 1 else n * fac (n-1)

This defines a new function called fac which computes the factorial of an integer.

We can now run fac on some argument:

Prelude> fac 42

Congratulations! Mathematics made easy.

Note that if you're using Hugs, you'll need to load the definition of fac from a file, fac.hs, containing:

fac n = if n == 0 then 1 else n * fac (n-1)

And run it with Hugs as follows:

Hugs.Base> :l fac.hs
Main> fac 42

We can compile this to produce a standalone executable. In the file fac.hs write, using elegant pattern matching instead of if-then-else:

fac 0 = 1
fac n = n * fac (n-1)
main = print (fac 42)

which we can then compile and run:

    $ ghc -o fac fac.hs
    $ ./fac

5 Where to go from here

There are many good Haskell tutorials and books. Here are some we recommend:





For more, see Learning Haskell and Books and tutorials.

Getting help

If you have questions, join the Haskell-Cafe mailing list or the IRC channel and ask. You can also ask questions here on the wiki, see Questions and answers. Information about Haskell support for various operating systems is here.