Why duplicate IDs are generated

[qzcsgs]

function genFlakeId() {
    const flakeIdGen = new FlakeId();
    return intformat(flakeIdGen.next(), 'dec');
  }

const ids = [];
for (let i = 0; i < 50; i++) {
  ids.push(genFlakeId());
}
// ids
[
  "6901552045816283136",
  "6901552045820477440",
  "6901552045820477440",
  "6901552045833060352",
  "6901552045837254656",
  "6901552045841448960",
  "6901552045845643264",
  "6901552045849837568",
  "6901552045854031872",
  "6901552045858226176",
  "6901552045862420480",
  "6901552045875003392",
  "6901552045879197696",
  "6901552045879197696",
  "6901552045879197696",
  "6901552045883392000",
  "6901552045883392000",
  "6901552045883392000",
  "6901552045883392000",
  "6901552045883392000",
  "6901552045887586304",
  "6901552045887586304",
  "6901552045887586304",
  "6901552045887586304",
  "6901552045887586304",
  "6901552045891780608",
  "6901552045891780608",
  "6901552045891780608",
  "6901552045891780608",
  "6901552045891780608",
  "6901552045895974912",
  "6901552045895974912",
  "6901552045895974912",
  "6901552045895974912",
  "6901552045900169216",
  "6901552045900169216",
  "6901552045900169216",
  "6901552045900169216",
  "6901552045900169216",
  "6901552045904363520",
  "6901552045904363520",
  "6901552045904363520",
  "6901552045908557824",
  "6901552045908557824",
  "6901552045908557824",
  "6901552045912752128",
  "6901552045912752128",
  "6901552045912752128",
  "6901552045916946432",
  "6901552045916946432"
]

[seancheung]

'cause you made a new FakeId instance in every push. They were not related(with their counters) so they raced.

You should do something like this

const flakeIdGen = new FlakeId();
function genFlakeId() {
    return intformat(flakeIdGen.next(), 'dec');
}

const ids = [];
for (let i = 0; i < 50; i++) {
  ids.push(genFlakeId());
}

[qzcsgs]

'cause you made a new FakeId instance in every push. They were not related(with their counters) so they raced.

You should do something like this

const flakeIdGen = new FlakeId();
function genFlakeId() {
    return intformat(flakeIdGen.next(), 'dec');
}

const ids = [];
for (let i = 0; i < 50; i++) {
  ids.push(genFlakeId());
}

thanks