Haskell

GHCi multiline

When in haskell REPL (ghci), to use multiline definitions:

First way, is to use blocks, like this:

1
2
3
4
Prelude> :{
Prelude| let addTwo :: Int -> Int -> Int
Prelude|     addTwo x y = x + y
Prelude| :}

Second way, use multiline mode:

1
2
3
4
5
Prelude> :set +m
Prelude> let addTwo :: Int -> Int -> Int
Prelude|     addTwo x y = x + y
Prelude|
Prelude> addTwo 1 3

Also, don’t forget, function definitions must start from let in REPL.

http://stackoverflow.com/questions/8443035/multi-line-commands-in-ghci