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Viewing file:     nanoid.js (1.03 KB)      -rw-r--r--

// This alphabet uses `A-Za-z0-9_-` symbols. The genetic algorithm helped
// optimize the gzip compression for this alphabet.
const urlAlphabet =
  'ModuleSymbhasOwnPr-0123456789ABCDEFGHNRVfgctiUvz_KqYTJkLxpZXIjQW';

const numberAlphabet = '0123456789';

/**
 * Generate URL-friendly unique ID. This method uses the non-secure
 * predictable random generator with bigger collision probability.
 * Based on https://github.com/ai/nanoid
 *
 * ```js
 * model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
 * ```
 *
 * @param size Size of the ID. The default size is 21.
 * @returns A random string.
 */
function nanoid(size = 21) {
  let id = '';
  // A compact alternative for `for (var i = 0; i < step; i++)`.
  let i = size;
  while (i--) {
    // `| 0` is more compact and faster than `Math.floor()`.
    id += urlAlphabet[(Math.random() * 64) | 0];
  }
  return id;
}

function nanonum(size = 21) {
  let id = '';
  let i = size;
  while (i--) {
    id += numberAlphabet[(Math.random() * 10) | 0];
  }
  return id;
}

module.exports = { nanoid, nanonum };