| // This alphabet uses `A-Za-z0-9_-` symbols. The genetic algorithm helped |
| // optimize the gzip compression for this alphabet. |
| let urlAlphabet = |
| 'ModuleSymbhasOwnPr-0123456789ABCDEFGHNRVfgctiUvz_KqYTJkLxpZXIjQW' |
| |
| let customAlphabet = (alphabet, size) => { |
| return () => { |
| 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 += alphabet[(Math.random() * alphabet.length) | 0] |
| } |
| return id |
| } |
| } |
| |
| let 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 |
| } |
| |
| module.exports = { nanoid, customAlphabet } |