CODEWITHSUNDEEP
haskell
user8314628
user8314628

Reputation: 2042

Can I define more than one function under the where syntax?

I just see an example, which is checking if a list is nondescendant

nondec :: Ord a => [a] -> Bool
nondec xs = and (map leq (zip xs (tail xs)))
            where leq (x, y) = x <= y

I'm wondering can I define more than one function under the where syntax.

For example, if the map function is undefined, can I define it as this

where leq (x, y) = x <= y
      map(...)

Upvotes: 0

Views: 109

Answers (2)

Alexey Romanov
Alexey Romanov

Reputation: 170713

can I define it as this

Why not try it? Because yes, you can do it exactly like this. leq and map just need to start in the same column and to the right of the column where the line with where starts (not necessarily to the right of where itself).

I think the Wikibook explains the rules for indentation quite well.

Upvotes: 3

bipll
bipll

Reputation: 11940

Indent, as usual:

nondec :: Ord a => [a] -> String
nondec as = map leq as where
                          leq = id
                          map _ _ = "Hi!"

Upvotes: 2

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