Create a 2-tuple.

{ foo = [1, 2], bar = Nothing }
    |> pairTo Cmd.none
--> ({ foo = [1, 2], bar = Nothing }, Cmd.none)

Create a 2-tuple.

double 0 --> (0, 0)

Swap the values in a 2-tuple.

swap ( '1', "1" ) --> ("1", '1')

Apply each value in a 2-tuple to a function that takes at least 2 arguments.

uncurry List.repeat ( 3, 'a' ) --> ['a', 'a', 'a']

Apply the second value in a 2-tuple to the function in the first position.

apply (String.toLower, "HELLO") --> "hello"

Apply a function that produces a Maybe to the first value in a 2-tuple. If it returns Just something, pair the something back with the second value in the 2-tuple.

("1", "horse")
  |> maybeMapFirst String.toInt
--> Just (1, "horse")


("One", "horse")
  |> maybeMapFirst String.toInt
--> Nothing

Apply a function that produces a Maybe to the second value in a 2-tuple. If it returns Just something, pair the something back with the first value in the 2-tuple.

("King", ["Kong", "Kunta", "Henry VIII"])
  |> maybeMapSecond List.head
--> Just ("King", "Kong")