Adding the BST methods to class. Insert, find, remove, max, min and traversal

bst-shell-es5.js

//ES5 version
function TreeNode(keyValue) {
    this.keyValue = keyValue;
    this.left = null;
    this.right = null;
    this.toString = function() {
        return this.keyValue;
    }
}

function BinarySearchTree() {
    var rootNode = null;
}

BinarySearchTree.prototype = {
    insert: function(key) {},
    find: function(key) {},
    remove: function(key) {},
    max: function(){},
    min: function() {},
    traverse: function(){}
}

bst-shell-modern.js

//ES2015 & beyond 
class TreeNode {
    constructor(keyValue) {
        this.keyValue = keyValue;
        this.left = null;
        this.right = null;
    }
}

class BinarySearchTree {
    constructor() {
        let root = null;
    }

    toString() {
        return this.keyValue;
    }

    insert(key) {}
    find(key) {}
    remove(key) {}
    max(){}
    min() {}
    traverse(){}
}