react-relay/lib/getWeakIdForObject.js

A framework for building data-driven React applications.

/**
 * Copyright 2013-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule getWeakIdForObject
 * 
 * @typechecks
 */

'use strict';

// Ensure non-guessable names for the id property in dev.
var KEY = '$getWeakIdForObject';
if (process.env.NODE_ENV !== 'production') {
  KEY += Math.random().toString(36).slice(2);
}

var _nextNodeID = 0;

/**
 * @internal
 *
 * Returns an ID which uniquely identifies the given `node` instance.
 */
function getWeakIdForObject(node) {
  var id = node[KEY];
  if (id == null) {
    id = (_nextNodeID++).toString(36);
    node[KEY] = id;
  }
  return id;
}

module.exports = getWeakIdForObject;