CODEWITHSUNDEEP
haskell
Kudla
Kudla

Reputation: 35

How I make result a list of booleans

I have this:

getMask (/= 3) [1, 2, 3, 4, 5]

and result must be this:

[True, True, False, True, True]

i tried something like this

getMask p xs = [x | (x,m) <- enumerate xs, if p x then True else False]

but i get only numbers. I need list of booleans

Upvotes: 1

Views: 71

Answers (1)

chi
chi

Reputation: 116139

You can use map :: (a -> b) -> [a] -> [b]:

> map (/= 3) [1, 2, 3, 4, 5]
[True,True,False,True,True]

or a simple list comprehension:

getMask p xs = [p x | x <- xs]

Upvotes: 6

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