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/143.0.0.0 Safari/537.36

Browser: Chrome 143

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

new Array()

150.4M/s

[] + fill undefined

35.9M/s

[] + fill void

35.8M/s

[] + fill zeroes

35.7M/s

new Array() zeroed

33.4M/s

[] + length

9.1M/s

Array.from()

89K/s

Array.from zeroes

75K/s

View exact numbers

Test name	Executions per second
✓ new Array()	150,420,768 Ops/sec
[] + fill undefined	35,854,520 Ops/sec
[] + fill void	35,793,496 Ops/sec
[] + fill zeroes	35,738,080 Ops/sec
new Array() zeroed	33,421,302 Ops/sec
[] + length	9,117,036 Ops/sec
Array.from()	88,778 Ops/sec
Array.from zeroes	75,044 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)