CODEWITHSUNDEEP
haskell
JohnnyPire
JohnnyPire

Reputation: 119

How to use map with several arguments - Haskell

Use map with several arguments?

Something like foldr or foldl?

Upvotes: 1

Views: 730

Answers (2)

Izaak Weiss
Izaak Weiss

Reputation: 1310

Haskell supports partial application, which means you can pass only a few arguments into a function, and you will get out a function which takes the rest of the arguments.

For example, I can take an expression like:

map (\x -> x*x) [1,2,3,4]

and rewrite it as:

let mapsquare = map (\x -> x*x) in mapsquare [1,2,3,4]

In the above case, I've taken the partially applied map, and assigning it to a variable, and then using that function of one argument on a list.

In your example, you could write let f = func str1 str2 in map f charls, or map (func str1 str2) charls.

Upvotes: 3

mschmidt
mschmidt

Reputation: 2790

If the other arguments are fixed, do a partial application. E.g.:

map (func arg1 arg2) your_list

Upvotes: 5

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