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

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Benchmark created on February 18, 2025

Setup

const isMultiByte = string =>
  [...string].some(c => c.codePointAt(0) > 255)
const isMultiByteFor = string => {
	for (let i = 0; i < string.length; ++i) {
		if (string.codePointAt(i) > 255) return true
	}
	return false
}
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Revision 1: published on February 18, 2025
Revision 2: published on February 18, 2025