30 lines
854 B
JavaScript
30 lines
854 B
JavaScript
// 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 }
|