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class GridMaster {    #grid: number[][];    #r2: number;
    #c2: number;    #row: number;    #col: number;    static #directions = { L: [0, -1], R: [0, 1], U: [-1, 0], D: [1, 0] };    constructor(        grid: number[][],        r1: number,        c1: number,        r2: number,        c2: number,    ) {        this.#grid = grid;        this.#row = r1;        this.#col = c1;        this.#r2 = r2;        this.#c2 = c2;    }    canMove(direction: string): boolean {        const row = this.#row;        const col = this.#col;        if (Reflect.has(GridMaster.#directions, direction)) {            const [a, b] = Reflect.get(GridMaster.#directions, direction);            const value = this.#grid[row + a]?.[col + b];
            return Boolean(value);        }
        return false;    }    move(direction: string): number {        if (this.canMove(direction)) {            const row = this.#row;            const col = this.#col;            const [a, b] = Reflect.get(GridMaster.#directions, direction);
            [this.#row, this.#col] = [row + a, col + b];
            return this.#grid[this.#row][this.#col];        }        return -1;    }    isTarget(): boolean {        return this.#row === this.#r2 && this.#col === this.#c2;    }}export { GridMaster as GridMaster };