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

fast index search

Benchmark created on September 17, 2023

Setup

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function a(str, a, b) {
  const i = str.indexOf(a)

  // No A character is present, just return the index of the B character.
  if (i === -1) {
    return str.indexOf(b)
  }

  // Searches for B characters before the A character.
  const j = str.substring(0, i).indexOf(b)

  if (j === -1 || j > i) {
    return i
  }

  return j
}

function b(str, a, b) {
  const i = str.indexOf(a)

  // No A character is present, just return the index of the B character.
  if (i === -1) {
    return str.indexOf(b)
  }

  // Searches for B characters before the A character.
  const j = str.indexOf(b)

  if (j === -1 || j > i) {
    return i
  }

  return j
}

function c(str, a, b) {
  const i = str.indexOf(a)

  // No A character is present, just return the index of the B character.
  if (i === -1) {
    return str.indexOf(b)
  }

  // Searches for B characters before the A character.
  const j = str.indexOf(b)

  return i >= j ? j : i
}

function d(str, a, b) {
  const i = str.indexOf(a)
const j = str.indexOf(b)
  // No A character is present, just return the index of the B character.
  if (i === -1) {
    return j
  }

  return  i >= j ? j : i
}

function e(str, a, b) {
  const i = str.indexOf(a)
const j = str.indexOf(b)
  // No A character is present, just return the index of the B character.
  if (i === -1 || i >= j) {
    return j
  }

  return     i
}

Test runner

Ready to run.

Testing in
Test		Ops/sec
a	`for(const i of data) { a(i.str, i.a, i.b) }`	ready
b	`for(const i of data) { b(i.str, i.a, i.b) }`	ready
c	`for(const i of data) { c(i.str, i.a, i.b) }`	ready
d	`for(const i of data) { d(i.str, i.a, i.b) }`	ready
e	`for(const i of data) { e(i.str, i.a, i.b) }`	ready

Revisions

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

Revision 1: published on September 17, 2023