skyquake/plugins/composer/src/src/libraries/guid.js

   1
   2 /*
   3  *
   4  *   Copyright 2016 RIFT.IO Inc
   5  *
   6  *   Licensed under the Apache License, Version 2.0 (the "License");
   7  *   you may not use this file except in compliance with the License.
   8  *   You may obtain a copy of the License at
   9  *
  10  *       http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *   Unless required by applicable law or agreed to in writing, software
  13  *   distributed under the License is distributed on an "AS IS" BASIS,
  14  *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *   See the License for the specific language governing permissions and
  16  *   limitations under the License.
  17  *
  18  */
  19 'use strict';
  20 const TEMPLATE = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
  21 export default function guid(len = TEMPLATE.length) {
  22         // http://byronsalau.com/blog/how-to-create-a-guid-uuid-in-javascript/
  23         return TEMPLATE.replace(/[xy]/g, function (c) {
  24                 var r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
  25                 return v.toString(16);
  26         }).substring(0, len);
  27 }