Function serial

javascript/0297-serialize-and-deserialize-binary-tree.js:14–19

(root, result)

};

const serial = (root, result) => {
    const isBase = root === null;
    if (isBase) return result.push(null);

    dfsSerialize(root, result);
};

const dfsSerialize = (node, result) => {
    result.push(node.val);