class Node{
constructor(value){
this.value=value;
this.left=null;
this.right=null;
}
}
class BinarySearchTree{
constructor(){
this.root=null;
}
insert(value){
const newNode=new Node(value);
if(this.root===null){
this.root=newNode;
}
else{
let currNode=this.root;
while(true){
if(value<currNode.value){
//left
if(!currNode.left){
currNode.left=newNode;
return this;
}
currNode=currNode.left;
}
else{
//right
if(!currNode.right){
currNode.right=newNode;
return this;
}
currNode=currNode.right;
}
}
}
}
lookup(value){
if(!this.root){
return false;
}
let currNode=this.root;
while(currNode){
if(value<currNode.value){
currNode=currNode.left;
}
else if(value>currNode.value){
currNode=currNode.right;
}
else if(value===currNode.value){
return currNode;
}
}
return false;
}
}
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);
tree.lookup(20);
