guid gen

Benchmark created on

Setup

var lut = Array.from({ length: 256 }, (_, i) => (i < 16 ? "0" : "") + (i).toString(16));

Test runner

Ready to run.

Testing in
TestOps/sec
cust
const d0 = Math.random() * 0xffffffff | 0;
const d1 = Math.random() * 0xffffffff | 0;
const d2 = Math.random() * 0xffffffff | 0;
const d3 = Math.random() * 0xffffffff | 0;

const res = 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];
ready
built-in
const res = crypto.randomUUID();
ready

Revisions

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