Haskell won't run in a repl, will it? GHCi and Hugs demand that functions be spe... | Hacker News

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		WildUtah on Sept 30, 2011 \| parent \| context \| favorite \| on: Try Python, Ruby, Lua, Scheme, QBasic, Forth ... Haskell won't run in a repl, will it? GHCi and Hugs demand that functions be specified in a script file and not at the prompt. Without functions, you really don't have very much of the Haskell language available. It's a partial repl with a fraction of the language at best.

jstepien on Oct 1, 2011 [–]

Not necessarily. You can define functions in GHCi using let.

  $ ghci
  Prelude> let fact x = if x == 0 then 1 else x * fact (x - 1)
  Prelude> fact 6
  720

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