tablecloth-base 0.0.9 (latest)

Functions for manipulating tuples of length two

Functions for manipulating pairs of values

type ('a, 'b) t = 'a * 'b

Create

val make : 'a -> 'b -> 'a * 'b

Create a two-tuple with the given values.

The values do not have to be of the same type.

Examples

Tuple2.make 3 "Clementine" = (3, "Clementine")

val from_array : 'a array -> ('a * 'a) option

Create a tuple from the first two elements of an Array.

If the array is longer than two elements, the extra elements are ignored.

If the array is less than two elements, returns None.

Examples

Tuple2.from_array [|1; 2|] = Some (1, 2)

Tuple2.from_array [|1|] = None

Tuple2.from_array [|4; 5; 6|] = Some (4, 5)

val from_list : 'a list -> ('a * 'a) option

Create a tuple from the first two elements of a List.

If the list is longer than two elements, the extra elements are ignored.

If the list is less than two elements, returns None.

Examples

Tuple2.from_list [1; 2] = Some (1, 2)

Tuple2.from_list [1] = None

Tuple2.from_list [4; 5; 6] = Some (4, 5)

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

Extract the first value from a tuple.

Examples

Tuple2.first (3, 4) = 3

Tuple2.first ("john", "doe") = "john"

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

Extract the second value from a tuple.

Examples

Tuple2.second (3, 4) = 4

Tuple2.second ("john", "doe") = "doe"

Transform

val map_first : ('a * 'b) -> f:('a -> 'x) -> 'x * 'b

Transform the first value in a tuple.

Examples

Tuple2.map_first ~f:String.reverse ("stressed", 16) = ("desserts", 16)

Tuple2.map_first ~f:String.length ("stressed", 16) = (8, 16)

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

Transform the second value in a tuple.

Examples

Tuple2.map_second ~f:Float.square_root ("stressed", 16.) = ("stressed", 4.)

Tuple2.map_second ~f:(~-) ("stressed", 16) = ("stressed", -16)

val map_each : ('a * 'b) -> f:('a -> 'x) -> g:('b -> 'y) -> 'x * 'y

Transform both values of a tuple, using f for the first value and g for the second.

Examples

Tuple2.map_each ~f:String.reverse ~g:Float.square_root ("stressed", 16.) = ("desserts", 4.)

Tuple2.map_each ~f:String.length ~g:(~-) ("stressed", 16) = (8, -16)

val map_all : ('a * 'a) -> f:('a -> 'b) -> 'b * 'b

Transform both of the values of a tuple using the same function.

map_all can only be used on tuples which have the same type for each value.

Examples

Tuple2.map_all ~f:(Int.add 1) (3, 4) = (4, 5)

Tuple2.map_all ~f:String.length ("was", "stressed") = (3, 8)

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

Switches the first and second values of a tuple.

Examples

Tuple2.swap (3, 4) = (4, 3)

Tuple2.swap ("stressed", 16) = (16, "stressed")

Convert

val to_array : ('a * 'a) -> 'a array

Turns a tuple into an Array of length two.

This function can only be used on tuples which have the same type for each value.

Examples

Tuple2.to_array (3, 4) = [|3; 4|]

Tuple2.to_array ("was", "stressed") = [|"was"; "stressed"|]

val to_list : ('a * 'a) -> 'a list

Turns a tuple into a list of length two. This function can only be used on tuples which have the same type for each value.

Examples

Tuple2.to_list (3, 4) = [3; 4]

Tuple2.to_list ("was", "stressed") = ["was"; "stressed"]

val equal : 
  ('a -> 'a -> bool) ->
  ('b -> 'b -> bool) ->
  ('a, 'b) t ->
  ('a, 'b) t ->
  bool

Test two Tuple2s for equality, using the provided functions to test the first and second components.

Examples

Tuple2.equal Int.equal String.equal (1, "Fox") (1, "Fox") = true

Tuple2.equal Int.equal String.equal (1, "Fox") (2, "Hen") = false

val compare : 
  f:('a -> 'a -> int) ->
  g:('b -> 'b -> int) ->
  ('a, 'b) t ->
  ('a, 'b) t ->
  int

Compare two Tuple2s, using the provided f function to compare the first components. Then, if the first components are equal, the second components are compared with g.

Examples

Tuple2.compare ~f:Int.compare ~g:String.compare (1, "Fox") (1, "Fox") = 0

Tuple2.compare ~f:Int.compare ~g:String.compare (1, "Fox") (1, "Eel") = 1

Tuple2.compare ~f:Int.compare ~g:String.compare (1, "Fox") (2, "Hen") = -1

package tablecloth-base

Create

Transform

Convert