@js-random/string/unpkg/global.js

A simple and lightweight string randomizer for JavaScript (TypeScript friendly)

(function () {
  'use strict';

  var charsPadding = 32;
  var charsAmount = 126 - 32;
  var defaultSeed = (function () {
      var seed = '';
      for (var char = charsPadding; char <= charsAmount; char++) {
          seed += String.fromCharCode(char);
      }
      return seed;
  })();
  var defaultFilter = /./;
  var defaultLength = 10;
  /**
   * Generates random string
   *
   * @param optionsOrLength string's length or object-style options
   * @param seed (optional) a string to be used as a seed for the new random string
   * @param filter to filter the resulting string by
   */
  function randomString(optionsOrLength, seed, filter) {
      var _length = defaultLength;
      var _filter = defaultFilter;
      var _seed = defaultSeed;
      if (typeof optionsOrLength === 'object') {
          _seed = optionsOrLength.seed || defaultSeed;
          _filter = optionsOrLength.filter || defaultFilter;
          _length = typeof optionsOrLength.length === 'number' ? optionsOrLength.length : defaultLength;
      }
      else if (typeof optionsOrLength === 'number') {
          _length = optionsOrLength;
          _filter = filter || defaultFilter;
          _seed = seed || defaultSeed;
      }
      var result = '';
      for (var i = 0; i < _length; i++) {
          result += _seed.split('')
              .sort(function () { return Math.random() - 0.5; })
              .find(function (char) { return _filter.test(char); });
      }
      return result;
  }

  String.random = randomString;

}());