42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
const characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
|
|
|
|
/**
|
|
* The Mulberry32 PRNG, JavaScript implementation. This is a seedable PRNG,
|
|
* which we need in order to deterministically generate IDs which are stable
|
|
* across reloads. Unfortunately, the built-in `Math.random` function
|
|
* is not seedable.
|
|
*
|
|
* Source:
|
|
* https://github.com/bryc/code/blob/master/jshash/PRNGs.md#mulberry32
|
|
*
|
|
* @param {number} a
|
|
* @return {number}
|
|
*/
|
|
function mulberry32(a = 0) {
|
|
return function () {
|
|
a += 0x6d2b79f5 | 0;
|
|
var t = Math.imul(a ^ (a >>> 15), 1 | a);
|
|
t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
|
|
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
|
|
};
|
|
}
|
|
|
|
const random = mulberry32();
|
|
|
|
/**
|
|
* Generates a random ID string at least 10 characters long with the
|
|
* specified prefix.
|
|
*
|
|
* @param {string} prefix
|
|
* @return {string}
|
|
*/
|
|
export default function (prefix = '') {
|
|
let result = '';
|
|
for (let i = 0; i < 10; i++) {
|
|
result = result.concat(
|
|
characters[Math.floor(random() * characters.length)]
|
|
);
|
|
}
|
|
return prefix.concat(result);
|
|
}
|