What is Haskell?
Haskell is a standardized, general-purpose, purely functional programming language with declarative and strong static typing.
Haskell has deep roots in mathematics, and you will soon learn to appreciate the implications of it.
Currently the latest version of GHC is 8.6 (as of 12 Oct 2018)
The recommended way to install Haskell is by using stack : stack download Stack is a cross-platform program for developing Haskell projects. It is aimed at Haskellers both new and experienced.
To actually start using Haskell you need the GHC (The Glasgow Haskell Compiler), so to setup : stack setup
stack new my-project cd my-project stack setup stack build stack exec my-project-exe
A word of cautious, try not to use stack install
Structure of a Haskell Function
A Haskell function declaration has a name and type identifiers
name :: type name = expression
For example, this function squares an Integer
square :: Integer -> Integer square n = n * n
The last type value is the return value, in the case above it takes a single integer and returns a single integer.
main :: IO () main = print "Hello Haskell :)"
Save the code above in a file named "hello.hs".
You can use ghc to convert our haskell code to machine understandable bytecodes.
stack ghc hello.hs ./hello
Alternatively, you can use
runhaskell to skip the compiling step.
stack runhaskell hello.hs
Hackage provides documentation for Haskell