CODEWITHSUNDEEP
haskell
yonutix
yonutix

Reputation: 2439

Haskell multiple if otherwise

Hello I'm trying to use imbricated conditions but I get parse error:

parse error on input ‘|’

isAssignMent::String->Bool
isAssignMent a
    | a == "" = False
    | otherwise
        | (head trimmed) == '=' = True
        | otherwise = False
        where 
            trimmed = trimRightSide a [' ', '\n']

What am I doing wrong? Thank you

Upvotes: 1

Views: 344

Answers (2)

ErikR
ErikR

Reputation: 52029

Is this what you want?

isAssignMent::String->Bool
isAssignMent a
    | a == "" = False
    | (head trimmed) == '=' = True
    | otherwise = False
        where 
            trimmed = trimRightSide a [' ', '\n']

Guard clauses are checked sequentially. You only need an otherwise clause at the very end.

Upvotes: 5

Ørjan Johansen
Ørjan Johansen

Reputation: 18189

You can also write this more idiomatically with pattern matching:

isAssignMent::String->Bool
isAssignMent ""         = False
isAssignMent a
    | '=':_ <- trimmed  = True
    | otherwise         = False
    where 
        trimmed = trimRightSide a [' ', '\n']

Upvotes: 5

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