Relude.Extra.Tuple

Contains utility functions for working with tuples.

Documentation

dupe :: a -> (a, a)

Creates a tuple by pairing something with itself.

>>> dupe "foo"
("foo","foo")
>>> dupe ()
((),())

mapToFst :: (a -> b) -> a -> (b, a)

Apply a function, with the result in the fst slot, and the value in the other.

A dual to mapToSnd

>>> mapToFst (+1) 10
(11,10)

mapToSnd :: (a -> b) -> a -> (a, b)

Apply a function, with the result in the second slot, and the value in the other.

A dual to mapToFst.

>>> mapToSnd (+1) 10
(10,11)

mapBoth :: (a -> b) -> (a, a) -> (b, b)

Maps a function over both elements of a tuple.

>>> mapBoth ("Hello " <>) ("Alice", "Bob")
("Hello Alice","Hello Bob")