# Find the Minimum and Maximum Height of a Binary Search Tree

Find the Minimum and Maximum Height of a Binary Search Tree
0

#1

Tell us what’s happening:
this.isBalanced method is not working.Help!

``````
var displayTree = (tree) => console.log(JSON.stringify(tree, null, 2));
function Node(value) {
this.value = value;
this.left = null;
this.right = null;
}
function BinarySearchTree() {
this.root = null;
// change code below this line
this.findMinHeight = function(root=this.root) {
if(root===null){
return -1;
}
else if(root.left===null && root.right===null){
return 0;
}
else if(root.left==null){
return (this.findMinHeight(root.right)+1);
}else if(root.right==null){
return (this.findMinHeight(root.left)+1);
}else{
return Math.min(this.findMinHeight(root.left),this.findMinHeight(root.right)) + 1;
}
}

this.findMaxHeight = function(root=this.root) {
if(root===null){
return -1;
}
else if(root.left===null && root.right===null){
return 0;
}
else if(root.left==null){
return (this.findMaxHeight(root.right)+1);
}else if(root.right==null){
return (this.findMaxHeight(root.left)+1);
}else{
return Math.max(this.findMaxHeight(root.left),this.findMaxHeight(root.right)) + 1;
}
}

this.isBalanced = function(root=this.root){
if(root===null || root.left===null || root.right===null){
return true;
}
let l = this.findMaxHeight(root.left);
let r = this.findMaxHeight(root.right);
let difference = Math.abs(r - l);
if(difference <= 1 && this.isBalanced(root.left) && this.isBalanced(root.right))
{
return true;
}
return false;
}
// change code above this line
}
``````

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