https://leetcode.com/problems/same-tree/

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/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} p
 * @param {TreeNode} q
 * @return {boolean}
 */
var isSameTree = function(p, q) {
    if (!p && !q) {
        return true
    }
    if (!p || !q) {
        return false
    }
    return p.val === q.val && isSameTree(p.left, q.left) && isSameTree(p.right, q.right)
};