how to limit array's type in specific order in typescript

Question

how to limit array's type in specific order in typescript instead of defining paradigm.

that means, in ts, we just declare a array definition like:

const arr:Array<any> = []

I want get a specific order in definition array,like:

const arr = ['string', 0, ...];

value can only be string tyoe at position 0, and can only be number type at position 1...

thanks

Answer 1

If you want to limit the size to 2 elements you can achieve this with a tuple

const myTuple: [string, number] = ['test', 3]

or extracted the tuple type definition into a type

type myTupleType = [string, number]
const myTuple2: myTupleType = ['test', 3]

Answer 2

It can be done with intersection type:

type OrderedArray<T> = Array<T> & {
    0?: string;
    1?: number;
}

const arr: OrderedArray<any> = ['string', 0, ...];