CODEWITHSUNDEEP
haskell
James Raquel
James Raquel

Reputation: 11

How to check if function is equal to a particular value in Haskell

For example, I have a function below.

function :: x -> y -> z -> v -> Bool

I want to do something if function is equal to True in guards like: 

| something = do something
| function == True = do something
| something = something do something

How can I implement it using a correct syntax?

Upvotes: 0

Views: 1042

Answers (1)

chi
chi

Reputation: 116139

You can simply call the function in your guard. Example:

bar :: Int -> Int
bar x = x*x

baz :: Int -> Int
baz x = x+2

baw :: Int -> Bool  -- note: this returns a Bool instead
baw x = x < 12

foo :: Int -> Int -> String
foo x y
  | x > 2               = "a"
  | bar x + baz y < 100 = "b"
  | baw x               = "c"
  | otherwise           = "d"

Upvotes: 5

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