JS Tree data structure

tree.js

    var Node = function (name) {
        this.children = [];
        this.name = name;
    }
     
    Node.prototype = {
        add: function (child) {
            this.children.push(child);
        },
     
        remove: function (child) {
            var length = this.children.length;
            for (var i = 0; i < length; i++) {
                if (this.children[i] === child) {
                    this.children.splice(i, 1);
                    return;
                }
            }
        },
     
        getChild: function (i) {
            return this.children[i];
        },
     
        hasChildren: function () {
            return this.children.length > 0;
        }
    }
     
    // recursively traverse a (sub)tree
    function traverse(indent, node) {
        log.add(Array(indent++).join("--") + node.name);
     
        for (var i = 0, len = node.children.length; i < len; i++) {
            traverse(indent, node.getChild(i));
        }
    }
     
    var log = (function () {
        var log = "";
     
        return {
            add: function (msg) { log += msg + "\n"; },
            show: function () { console.log(log); log = ""; }
        }
    })();
     
    // execute... run
    function run() {
        var executive = new Node("CEO");
        var vpOne     = new Node("VP of Happiness");
        var vpTwo     = new Node("VP of Finance");
        var dirPromo  = new Node("Director of Promo");
        var dirGive   = new Node("Director of Giveaways");
        var dirRec    = new Node("Director of Recievables");
        var dirSales  = new Node("Director of Sales");
        var mSalesOne = new Node("Manager of Sales 1");
        var mSalesTwo = new Node("Manager of Sales 2");
      
        executive.add(vpOne);
        executive.add(vpTwo);
     
        vpOne.add(dirPromo);
        vpOne.add(dirGive);
     
        vpTwo.add(dirRec);
        vpTwo.add(dirSales);
      
        dirRec.add(mSalesOne);
        dirSales.add(mSalesTwo);
        dirSales.remove(mSalesTwo); // remove ex.
        dirSales.add(mSalesTwo);
      
        traverse(1, executive);
     
        log.show();
    }

    run();

    /* OUTPUTS:
    
    CEO
    --VP of Happiness
    ----Director of Promo
    ----Director of Giveaways
    --VP of Finance
    ----Director of Recievables
    ------Manager of Sales 1
    ----Director of Sales
    ------Manager of Sales 2
    
    */

line 51: there is declaration of currentTree ?

Updated, check now