Run results for: array construction comparison - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

new Array()

184.0M/s

[] + fill void

66.4M/s

[] + fill undefined

65.1M/s

[] + fill zeroes

63.2M/s

new Array() zeroed

62.7M/s

[] + length

9.3M/s

Array.from()

96K/s

Array.from zeroes

84K/s

View exact numbers

Test name	Executions per second
✓ new Array()	183,996,320 Ops/sec
[] + fill void	66,381,924 Ops/sec
[] + fill undefined	65,098,532 Ops/sec
[] + fill zeroes	63,201,008 Ops/sec
new Array() zeroed	62,718,416 Ops/sec
[] + length	9,324,364 Ops/sec
Array.from()	95,791 Ops/sec
Array.from zeroes	84,161 Ops/sec

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)