https://leetcode.com/problems/maximum-depth-of-binary-tree/

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/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} root
 * @return {number}
 */
var maxDepth = function(root) {
    if (!root) {
        return 0
    }
    return 1 + Math.max(maxDepth(root.left), maxDepth(root.right))
};