<prompt> Kutokana na mizizi ya mti binary, kurudi preorder traversal ya maadili node yake. Andika ufumbuzi katika JavaScriptDefinition for a binary tree node. function TreeNodeval, left, right this.val valundefined ? 0 : val this.left leftundefined ? null : left this.right rightundefined ? null : right param TreeNode root return number var preorderTraversal functionroot ;  <response>: You can solve this problem by implementing a recursive preorder traversal algorithm. Heres the JavaScript code to do that:var preorderTraversal functionroot if !root return ; let result root.val; result result.concatpreorderTraversalroot.left; result result.concatpreorderTraversalroot.right; return result;;This code checks if the root exists and if not, returns an empty array. If the root exists, it creates an array with the root value as the first element. Then it calls itself recursively with the left child and right child of the root and concatenates the resulting arrays with the root value array. Finally, it returns the concatenated array. 