purescript-pairs
This module defines a datatype Pair together with a few useful instances and
helper functions. Note that this is not just Tuple a a but rather a list
with exactly two elements. Specifically, the Functor instance maps over both
values in contrast to the Functor instance for Tuple a, which can only map
over the second argument.
Example
> let point1 = 2 ~ 3
> let point2 = 4 ~ 7
> sum point1
5
> (+) <$> point1 <*> point2
(6 ~ 10)
> ("Hello" ~ "foo") <> pure " " <> ("World" ~ "bar")
("Hello World" ~ "foo bar")
> collect (\x → x ~ x*x) (1 .. 5)
([1,2,3,4,5] ~ [1,4,9,16,25])