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export default class Vector2D {    #gen: Generator<number, void, unknown>;    #result: IteratorResult<number, void>;    constructor(v: number[][]) {        this.#gen = Vector2DGenerator(v);        this.#result = this.#gen.next();    }    hasNext() {        return !this.#result.done;    }    next() {        const res = Number(this.#result.value);        this.#result = this.#gen.next();        return res;    }}export function* Vector2DGenerator(v: number[][]) {    for (const a of v) {        for (const b of a) {            yield b;        }    }}