class sell {
    #table = [];
    push() {
        this.#table[this.#table.length] = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,];
    }
    write(A,B) {
        this.#table[A[0]][A[1]]=B;
    }
    get(A) {
        return this.#table[A[0]][A[1]]
    }
}

const t = new sell();
t.push();

t.write([0, 0], (t.get([0, 0])+1));
console.log(t.get([0, 0]));