Maximum Binary Tree.js

var constructMaximumBinaryTree = function(nums) {
    if (nums.length === 0) return null;
    let max = Math.max(...nums);
    let index = nums.indexOf(max);
    let left = nums.slice(0, index);
    let right = nums.slice(index + 1);
    let root = new TreeNode(max);
    root.left = constructMaximumBinaryTree(left);
    root.right = constructMaximumBinaryTree(right);
    return root;
};