Data Structures: Find the Minimum and Maximum Height of a Binary Search Tree

Data Structures/bstMinMaxHeight.js

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+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;
+  // Only change code below this line
+  this.findMinHeight = () => {
+    let height = -1;
+    if (this.root === null) return height;
+    let q = [this.root];
+    let nextQ = [];
+    while (q.length) {
+      height++;
+      for (let node of q) {
+        if (node.left === null && node.right === null) {
+          return height;
+        }
+        if (node.left !== null) nextQ.push(node.left);
+        if (node.right !== null) nextQ.push(node.right);
+      }
+      q = nextQ;
+      nextQ = [];
+    }
+    return height;
+  };
+  this.findMaxHeight = () => {
+    let height = -1;
+    if (this.root === null) return height;
+    let q = [this.root];
+    let nextQ = [];
+    while (q.length) {
+      height++;
+      for (let node of q) {
+        if (node.left !== null) nextQ.push(node.left);
+        if (node.right !== null) nextQ.push(node.right);
+      }
+      q = nextQ;
+      nextQ = [];
+    }
+    return height;
+  };
+  this.isBalanced = () => {
+    return this.findMaxHeight() - this.findMinHeight() < 2;
+  };
+  // Only change code above this line
+}