package containers

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  1. Tuple Functions
package containers
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Tuple Functions

type ('a, 'b) t = 'a * 'b
val make : 'a -> 'b -> ('a, 'b) t

Make a tuple from its components

  • since 0.16
val map1 : ('a -> 'b) -> ('a * 'c) -> 'b * 'c
val map2 : ('a -> 'b) -> ('c * 'a) -> 'c * 'b
val map : ('a -> 'c) -> ('b -> 'd) -> ('a * 'b) -> 'c * 'd
val map_same : ('a -> 'b) -> ('a * 'a) -> 'b * 'b
val map_fst : ('a -> 'b) -> ('a * _) -> 'b

Compose the given function with fst.

  • since 0.3.3
val map_snd : ('a -> 'b) -> (_ * 'a) -> 'b

Compose the given function with snd.

  • since 0.3.3
val iter : ('a -> 'b -> unit) -> ('a * 'b) -> unit
val swap : ('a * 'b) -> 'b * 'a

Swap the components of the tuple

val (<<<) : ('a -> 'b) -> ('a * 'c) -> 'b * 'c

Map on the left side of the tuple

val (>>>) : ('a -> 'b) -> ('c * 'a) -> 'c * 'b

Map on the right side of the tuple

val (***) : ('a -> 'c) -> ('b -> 'd) -> ('a * 'b) -> 'c * 'd

Map on both sides of a tuple

val (&&&) : ('a -> 'b) -> ('a -> 'c) -> 'a -> 'b * 'c

f &&& g is fun x -> f x, g x. It splits the computations into two parts

val merge : ('a -> 'b -> 'c) -> ('a * 'b) -> 'c

Uncurrying (merges the two components of a tuple)

val fold : ('a -> 'b -> 'c) -> ('a * 'b) -> 'c

Synonym to merge

  • since 0.3.3
val dup : 'a -> 'a * 'a

dup x = (x,x) (duplicate the value)

  • since 0.3.3
val dup_map : ('a -> 'b) -> 'a -> 'a * 'b

dup_map f x = (x, f x). Duplicates the value and applies the function to the second copy.

  • since 0.3.3
val equal : ('a -> 'a -> bool) -> ('b -> 'b -> bool) -> ('a * 'b) -> ('a * 'b) -> bool
val compare : ('a -> 'a -> int) -> ('b -> 'b -> int) -> ('a * 'b) -> ('a * 'b) -> int
type 'a printer = Buffer.t -> 'a -> unit
type 'a formatter = Format.formatter -> 'a -> unit
val pp : 'a printer -> 'b printer -> ('a * 'b) printer
val print : 'a formatter -> 'b formatter -> ('a * 'b) formatter
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