class Node {
constructor(value) {
this.left = null;
this.right = null;
this.value = value;
}
}
class BinarySearchTree {
constructor() {
this.root = null;
}
insert(value) {
const newNode = new Node(value);
if (this.root === null) {
this.root = newNode;
return this;
}
let parent = this.root;
while(true) {
if (parent.value > value) {
// Left
if (parent.left !== null) {
parent = parent.left;
} else {
parent.left = newNode;
return this;
}
} else {
// Right
if (parent.right !== null) {
parent = parent.right;
} else {
parent.right = newNode;
return this;
}
}
}
}
lookup(value) {
let currentNode = this.root;
while(currentNode !== null) {
if (currentNode.value === value) {
return currentNode;
}
if (currentNode.value > value) {
currentNode = currentNode.left;
} else {
currentNode = currentNode.right;
}
}
console.log("Not found " + value);
return this;
}
remove(value) {
}
}
const tree = new BinarySearchTree();
tree.insert(9);
tree.insert(4);
tree.insert(6);
tree.insert(20);
tree.insert(170);
tree.insert(15);
tree.insert(1);
console.log("Found " + tree.lookup(15).value);
console.log(tree);
JSON.stringify(traverse(tree.root));
console.log(tree.lookup(20));
// 9
// 4 20
//1 6 15 170
function traverse(node) {
const tree = { value: node.value };
tree.left = node.left === null ? null : traverse(node.left);
tree.right = node.right === null ? null : traverse(node.right);
return tree;
}
