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ts declare array of fixed lengths

Gifted Grouse answered on March 27, 2023 Popularity 3/10 Helpfulness 1/10

answer ts declare array of fixed lengths

related typescript array of fixed length

ts declare array of fixed lengths

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TypeScript has tuple types which let you define an array with a specific length and types:

let arr: [number, number, number];

arr = [1, 2, 3]; // ok
arr = [1, 2]; // Type '[number, number]' is not assignable to type '[number, number, number]'
arr = [1, 2, "3"]; // Type '[number, number, string]' is not assignable to type '[number, number, number]'

Popularity 3/10 Helpfulness 1/10 Language typescript

Source: stackoverflow.com

Tags: declare fixed typescript

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Contributed on Jan 01 2024

Gifted Grouse

0 Answers Avg Quality 2/10

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typescript array of fixed length

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With Recursive conditional types (added in TypeScript 4.1.0) it is possible to:

type Tuple = N extends N ? number extends N ? T[] : _TupleOf : never;
type _TupleOf = R['length'] extends N ? R : _TupleOf;

Then you can use the type:

const stringTupleOfLength3: Tuple = ['foo', 'bar', 'baz'];

Popularity 7/10 Helpfulness 2/10 Language typescript

Source: Grepper

Tags: typescript fixed type

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Contributed on Mar 27 2023

silvio2402

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ts declare array of fixed lengths

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