637. Average of Levels in Binary Tree Javascript Explained

Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Problem link: https://leetcode.com/problems/average-of-levels-in-binary-tree/ Example 1: Input: 3 / \ 9 20 / \ 15 7 Output: [3, 14.5, 11] Explanation: The average value of nodes on level 0 is 3, on level 1 is 14.5, and on level 2 is 11. Hence return [3, 14.5, 11]