/**
 *
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

function TreeNode(val) {
  this.val = val
  this.left = this.right = null
}

const findClosestValueInBinarySearchTree = (root, target) => {
  let closestDistance = Infinity
  const traverse = root => {
    if (root == null) {
      return
    }
    if (Math.abs(target - root.val) < Math.abs(target - closestDistance)) {
      closestDistance = root.val
    }
    if (target > root.val) {
      traverse(root.right)
    } else {
      traverse(root.left)
    }
  }
  traverse(root)
  return closestDistance
}

const t1 = new TreeNode(10)
t1.left = new TreeNode(5)
t1.left.left = new TreeNode(2)
t1.left.left.left = new TreeNode(1)
t1.left.right = new TreeNode(5)
t1.right = new TreeNode(15)
t1.right.left = new TreeNode(13)
t1.right.left.right = new TreeNode(14)
t1.right.right = new TreeNode(22)
console.log(findClosestValueInBinarySearchTree(t1, 12))