Create an Array of Tuples in Typescript

Question

It's easy to create a generic pair type ( simplest possible Tuple ) i.e.

type Pair<A, B> = [A, B]

The question is how to create an type which represents and array of such generic pairs.

The only requirement is for element in the array to be a pair. The type of the first element and the type of the second element ought to be polymorphic, any does not make the cut, otherwise this would be satisfactory:

type Pair = [any, any]
type Pairs = Pair[]

Wait, why doesn't Array<[any, any]> work? I don't understand what you mean by "polymorphic" here. — jcalz
– jcalz, Commented May 2, 2019 at 0:44

Shanon Jackson · Accepted Answer · 2019-05-02 03:29:21Z

26

Pair<T, K> is the same as [T, K] yes, it will do what you want but its syntactically unnecessary.

To create an array of tuples it just would be Array<[TYPE, TYPE]> or [TYPE, TYPE][]

answered May 2, 2019 at 3:29

Shanon Jackson

6,6511 gold badge26 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ttugates · Accepted Answer · 2019-05-02 00:30:18Z

15

I feel like I am missing a nuance here.. But believe this is what you are asking for:

type Pair<T,K> = [T,K];
type Pairs<T,K> = Pair<T,K>[];

  const apple: Pair<number,number> = [2,3];
  const orange: Pair<number,number> = [3,4];
  const food: Pairs<number, number> = [apple, orange];

answered May 2, 2019 at 0:30

ttugates

6,3624 gold badges48 silver badges58 bronze badges

Collectives™ on Stack Overflow

Create an Array of Tuples in Typescript

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related