How to type array of array of numbers in typescript?

Question

I want to type array of any number of arrays with 3 coordinates each :

[[1,2,3], [4,5,6],...]

I'd like something like this except it doesn't work

Array<Array<Number,Number,Number>>

An array with fixed length and positional types is called a tuple in typescript. typescriptlang.org/docs/handbook/basic-types.html#tuple — known-as-bmf
– known-as-bmf, Commented Aug 14, 2020 at 10:18

Nikita Madeev · Accepted Answer · 2020-08-14 10:14:59Z

3

Playground

type MyArray = [number, number, number][];

const test1: MyArray = [[1, 2, 3]];
const test2: MyArray = [[1, 2, 3], [4, 5, 6]];
const test3: MyArray = [[1, 2, 3], [1]]; // error
const test4: MyArray = [[1, 2, 3], [4, 5, 6, 7]]; // error

answered Aug 14, 2020 at 10:14

Nikita Madeev

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