JavaScript: Walk method (Safe-Navigation)

gistfile1.js

/**
 * Walks the object by the specified path and returns the value.
 *
 * @see http://groovy.codehaus.org/Operators#Operators-SafeNavigationOperator
 * @see "The Existential Operator" at http://coffeescript.org/#operators
 *
 * @example
 * var foo = { bar: { baz: true }, biz: null };
 *
 * walk(foo, 'bar.baz'); //-> true
 * walk(foo, 'baz.bar'); //-> undefined
 * walk(foo, 'biz.bar'); //-> undefined
 *
 * @param  {Object} object
 * @param  {Array|String} path A dot notated path or an array of paths.
 *
 * @return {Mixed|undefined} Returns undefined when not found.
 */
function walk(object, path) {
  if (typeof path == 'string') {
    path = path.split('.');
  }

  for (var i = 0, len = path.length; i < len; i++) {
    if (!object || typeof (object = object[path[i]]) == 'undefined') {
      object = undefined;
      break;
    }
  }

  return object;
}

@NeoPhi, fixed! Thanks!