@orbit/utils
Version:
Core utilities for Orbit.
45 lines • 5.18 kB
JavaScript
;
/**
* Fast UUID generator, RFC4122 version 4 compliant.
* @author Jeff Ward (jcward.com).
* @license MIT license
* @link http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136
**/
Object.defineProperty(exports, "__esModule", { value: true });
exports.uuid = void 0;
const lut = [];
for (let i = 0; i < 256; i++) {
lut[i] = (i < 16 ? '0' : '') + i.toString(16);
}
/**
* `uuid` generates a Version 4 UUID using Jeff Ward's high performance
* generator.
*/
function uuid() {
let d0 = (Math.random() * 0xffffffff) | 0;
let d1 = (Math.random() * 0xffffffff) | 0;
let d2 = (Math.random() * 0xffffffff) | 0;
let d3 = (Math.random() * 0xffffffff) | 0;
return (lut[d0 & 0xff] +
lut[(d0 >> 8) & 0xff] +
lut[(d0 >> 16) & 0xff] +
lut[(d0 >> 24) & 0xff] +
'-' +
lut[d1 & 0xff] +
lut[(d1 >> 8) & 0xff] +
'-' +
lut[((d1 >> 16) & 0x0f) | 0x40] +
lut[(d1 >> 24) & 0xff] +
'-' +
lut[(d2 & 0x3f) | 0x80] +
lut[(d2 >> 8) & 0xff] +
'-' +
lut[(d2 >> 16) & 0xff] +
lut[(d2 >> 24) & 0xff] +
lut[d3 & 0xff] +
lut[(d3 >> 8) & 0xff] +
lut[(d3 >> 16) & 0xff] +
lut[(d3 >> 24) & 0xff]);
}
exports.uuid = uuid;
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