// This alphabet uses a-z A-Z 0-9 _- symbols.
// Despite the fact the source code is quite long, its entropy
// is low and there are lots of duplicates - just what compressors
// like GZIP and Brotli likes the best.

/**
 * URL safe symbols.
 *
 * @name url
 * @type {string}
 *
 * @example
 * const url = require('nanoid/url')
 * generate(url, 10) //=> "Uakgb_J5m9"
 */

// This alphabet uses a-z A-Z 0-9 _- symbols.
// Symbols are generated for smaller size.
// -_zyxwvutsrqponmlkjihgfedcba9876543210ZYXWVUTSRQPONMLKJIHGFEDCBA
module.exports = '-_'
var i = 36
while (i--) {
  // 36 is radix. Number.prototype.toString(36) returns number
  // in Base36 representation. Base36 is like hex, but it uses 0–9 and a-z.
  module.exports += i.toString(36)
  i > 9 && (module.exports += i.toString(36).toUpperCase())
}