LeetCode #100 - Same Tree (JavaScript)

const isSameTree = (p, q) => {
    if (!p && !q) {
        return true;
    }

    if (!p || !q || p.val !== q.val) {
        return false;
    }

    return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
};