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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

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const formatNumber = (x, fractionDigits) => {
  return Number(x.toFixed(fractionDigits ?? 3).replace(/\.?0*$/, ''))
}

Test #2

Title *

Async

Code *

const formatNumber = (x, fractionDigits) => {
  const powed = Math.pow(10, fractionDigits ?? 2)
  return Math.round(Number(String(x).replace(/,/gi, '.')) * powed) / powed
}

Test #3

Title *

Async

Code *

const formatNumber = (x, fractionDigits) => {
  const powed = Math.pow(10, fractionDigits ?? 2)
  return Math.round(x * powed) / powed
}

Test #4

Title *

Async

Code *

const formatNumber = (x, fractionDigits) => {
  return Number(Number(x).toFixed(fractionDigits ?? 3).replace(/\.?0*$/, ''))
}