org.js

var staff = require('./phonebook.json');

staff = staff.map(function (e) {
  return {
    cn: e.cn,
    dn: e.dn,
    manager: e.manager,
    title: e.title
  };
});

var root = staff.filter(function (e) {
  return e.cn.indexOf('Baker') > -1;
})[0];

root.walked = true;
getReports(root);

function getReports(node) {
  node.reports = staff.filter(function (e) {
    if (!e.walked && e.manager && e.manager.dn === node.dn) {
      e.walked = true;
      return true;
    }
    return false;
  });
  node.reports.forEach(getReports);
}

var depth = 0;

function walk(node, callback) {
  depth++;
  var middle = false;
  node.reports.forEach(function (e) {
    if (e.reports.length) {
      middle = true;
    }
  });
  callback(node);
  if (node.reports.length) {
    node.reports.forEach(walk);
  }
  depth--;
}