map function


title: map function

map function

The map function is a built-in haskell’s function that maps a function to each element of a list and return a new list
with the result. Graphically, it would look like this.

map f [1,2,3,4] -- [f 1, f 2, f 3, f 4]

Signature of map

The signature of the map function is as follows

map :: (a -> b) -> [a] -> [b]

Examples

map succ [1..5] -- [2,3,4,5,6] let sample = [(1, 2), (3, 1), (4, 10)] map fst sample -- [1,3,4] map snd sample -- [2,1,10] import Data.Char (toLower) # to get the toLower map toLower "HELLO WORLD HASKELL RULEZ!" -- "hello world haskell rulez!"

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