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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

const randomString = () => Math.random().toString(36).slice(2, 7)

const getAllBuckets = () => {
    return new Array(2e5).fill(1).map((b) => randomString())
}

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const all = getAllBuckets()
const excludedLookup = new Set(all)
const included = []

for (const b of all) {
	if (!excludedLookup.has(b)) {
		included.push(b)
	}
}

Test #2

Title *

Async

Code *

const all = getAllBuckets()
const allSet = new Set(all)

for (const b of all) {
	allSet.delete(b)
}

const done = Array.from(allSet)

Test #3

Title *

Async

Code *

const all = getAllBuckets()
const excludedLookup = new Set(all.slice(0, 10))
const included = []

for (const b of all) {
	if (!excludedLookup.has(b)) {
		included.push(b)
	}
}

Test #4

Title *

Async

Code *

const all = getAllBuckets()
const allSet = new Set(all)

for (const b of all.slice(10)) {
	allSet.delete(b)
}

const done = Array.from(allSet)