What is a tuple?

Learn tuple, fixed-length ordered arrays.

What is a tuple?

A tuple is an array with a fixed length and a specific type at each position. While a regular array holds elements of one type, a tuple lets you place different types side by side in a specific order. The order of types matters: [string, number] and [number, string] are different tuple types.

let kisi: [string, number] = ["Ayşe", 28];
//  two-element, ordered tuple

A tuple is the type-safe way to group a few related values in a single variable.

Tuple type syntax

A tuple type is written as a comma-separated list of types inside square brackets: [type1, type2, ...]. The number of types sets the tuple's length. You can use the string, number and boolean types you have already seen at any position.

let nokta: [number, number] = [3, 4];
let bayrak: [boolean, string] = [true, "aktif"];

A wrong number of elements or a wrong type order produces a compile error.

Exercise Name and age tuple

Declare a variable named kisi with type [string, number] and value ["Ayşe", 28]. Print the age value with console.log.

Show example solution

let kisi: [string, number] = ["Ayşe", 28];
console.log(kisi[1]);

Test yourself

What is the key feature that distinguishes a tuple from a regular array in TypeScript?
- It has a fixed length and a specific type at each position
- It can hold only numbers
- It has no length limit
- It can hold only strings
Show answer

It has a fixed length and a specific type at each position — A tuple's length is fixed by its type list and each position has its own type; a regular array holds elements of one type.

Complete the tuple type

let nokta: [number, ____] = [3, 4];

Show answer

let nokta: [number, number] = [3, 4];

Tuple parts

[string, number]

Two-element ordered tuple type
number[]

Array where all elements share one type
[boolean, boolean]

Two-element boolean tuple
Tuple

Fixed-length and ordered array

Next lesson: Tuple usage

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