Property chain check

gistfile1.js

  "use strict";

  /**
   * Verify if all sub properties exist of an object.
   *
   * @example
   * For example to verify if window.class.foo.bar.x exist:
   * propertyChainExist(window, ['class', 'foo', 'bar', 'x']);
   *
   * @param object
   *  Start object.
   * @param properties
   *  Array of string property names.
   * @returns {boolean}
   */
  var propertyChainExist = function ( object, properties ) {
    var current_object = object;

    var property;
    while (property = properties.shift()) {
      if (!current_object.hasOwnProperty(property)) {
        return false;
      }
      current_object = current_object[property];
    }

    return true;
  };