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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

let arr = [];
for (i = 0; i < 1000; i++) {
  arr[i] = {key: i, value: i+1}
}


function objarr2obj(ar, {key, value}) {
    const redfunc = (obj, item) => (obj[item[key]] = item[value], obj)
	return ar.reduce(redfunc, {})
}

Teardown JS

Test cases

Test #1

Title *

Async

Code *const objc = arr.reduce((obj, item) => { obj[item.key] = item.value; return obj} ,{});

Test #2

Title *

Async

Code *const objc = Object.fromEntries(arr.map(item => [item.key, item.value]));

Test #3

Title *

Async

Code *const objc = arr.reduce((obj, item) => (obj[item.key] = item.value, obj), {});

Test #4

Title *

Async

Code *const objc = objarr2obj(arr, {key: 'key', value: 'value'})