Haskell - where "clause" multiple variables

Asked May 11 '17 at 12:38

Active May 11 '17 at 12:38

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I am trying to pick up some basic Haskell skills and wrote the following code:

pennypincherRec :: [Int] -> Int
pennypincherRec (x : xs) | deducted <= 19900 = deducted + rest
                        | otherwise = rest
                        where deducted = discount x
                              rest = pennypincherRec xs

It works if I replace the "rest" with "pennypincherRec xs" and remove the last line.

With the code above, it gives: parse error on input `rest'

So how do I use the where clause for multiple variables?

asked May 11 '17 at 12:38

Tedy S.

1

Double check you don't have TAB characters in your source file. – chi May 11 '17 at 12:46
@chi so what should I have? 4 spaces for each tab? – Tedy S. May 11 '17 at 13:00
Yep, that was it... so I had tabs from the beginning on the line until "rest" – Tedy S. May 11 '17 at 13:01
Don't use tabs at all; the required amount of space is determined by the structure of the preceding line, not any fixed number of spaces. – chepner May 11 '17 at 13:03

Haskell - where "clause" multiple variables

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