Run results for: array construction comparison - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser: Chrome 112

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
new Array()	3596301.0 Ops/sec
Array.from()	52363.2 Ops/sec
[] + length	4487997.0 Ops/sec
[] + fill undefined	8923331.0 Ops/sec
[] + fill void	44257100.0 Ops/sec
new Array() zeroed	8672663.0 Ops/sec
Array.from zeroes	47012.9 Ops/sec
[] + fill zeroes	45921900.0 Ops/sec

Website performance monitoring

Tests:

new Array()
new Array(500)
Array.from()
Array.from({ length: 500 })
[] + length
let a = []; a.length = 500;
[] + fill undefined
[].fill(undefined, 0, 500)
[] + fill void
[].fill(void 0, 0, 500)
new Array() zeroed
new Array().fill(0, 0, 500)
Array.from zeroes
Array.from({ length: 500 }, () => 0)
[] + fill zeroes
[].fill(0, 0, 500)