jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

advent of code day 1

Benchmark created on December 3, 2025

Setup

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L36
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R35
R28
L35
L37
R16
R7
L41
L38
R13
L40
R33
R49
R6
L47
L4
L11`

Test runner

Ready to run.

Test Ops/sec

o(n) without ifs

Testing in
Test	Ops/sec
o(n) without ifs	const lines = window.input.split("\n"); let count = 0; let curr_state = 50; for (const line of lines) { const direction = line[0] === "L" ? -1 : 1; const amount = +line.slice(1); const prev_state = curr_state; curr_state += direction * amount; const lo_diff = ((prev_state / 100) \| 0) - ((curr_state / 100) \| 0); const hi_diff = (((prev_state - 1) / 100) \| 0) - (((curr_state - 1) / 100) \| 0); count += (lo_diff < 0 ? -lo_diff : lo_diff) + (hi_diff < 0 ? -hi_diff : hi_diff); } console.log(count / 2);	ready
andris	const lines = window.input.split("\n"); let count = 0; let curr_state = 50; for (const line of lines) { const direction = line[0] === "L" ? -1 : 1; let amount = 0; for (let i = 1; i < line.length; i++) { amount = amount * 10 + (line[i] - "0"); } const prev_state = curr_state; curr_state += direction * amount; const lo_diff = ((curr_state / 100) \| 0) - ((prev_state / 100) \| 0); const hi_diff = (((curr_state - 1) / 100) \| 0) - (((prev_state - 1) / 100) \| 0); count += (lo_diff < 0 ? -lo_diff : lo_diff) + (hi_diff < 0 ? -hi_diff : hi_diff); } console.log(count / 2);	ready

const lines = window.input.split("\n");
let count = 0;
let curr_state = 50;

for (const line of lines) {
  const direction = line[0] === "L" ? -1 : 1;
  const amount = +line.slice(1);

  const prev_state = curr_state;
  curr_state += direction * amount;

  const lo_diff = ((prev_state / 100) | 0) - ((curr_state / 100) | 0);
  const hi_diff =
    (((prev_state - 1) / 100) | 0) - (((curr_state - 1) / 100) | 0);

  count +=
    (lo_diff < 0 ? -lo_diff : lo_diff) + (hi_diff < 0 ? -hi_diff : hi_diff);
}

console.log(count / 2);

ready

andris

const lines = window.input.split("\n");
let count = 0;
let curr_state = 50;

for (const line of lines) {
  const direction = line[0] === "L" ? -1 : 1;

  let amount = 0;
  for (let i = 1; i < line.length; i++) {
    amount = amount * 10 + (line[i] - "0");
  }

  const prev_state = curr_state;
  curr_state += direction * amount;

  const lo_diff =
    ((curr_state / 100) | 0) - ((prev_state / 100) | 0);

  const hi_diff =
    (((curr_state - 1) / 100) | 0) -
    (((prev_state - 1) / 100) | 0);

  count +=
    (lo_diff < 0 ? -lo_diff : lo_diff) +
    (hi_diff < 0 ? -hi_diff : hi_diff);
}

console.log(count / 2);

ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published on December 3, 2025