Run results for: array construction comparison - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/117.0

Browser: Firefox 117

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

new Array()

1778.5M/s

[] + fill void

132.0M/s

[] + fill zeroes

131.9M/s

[] + fill undefined

107.7M/s

new Array() zeroed

93.3M/s

[] + length

91.6M/s

Array.from()

904K/s

Array.from zeroes

819K/s

View exact numbers

Test name	Executions per second
✓ new Array()	1,778,515,328 Ops/sec
[] + fill void	132,005,272 Ops/sec
[] + fill zeroes	131,934,096 Ops/sec
[] + fill undefined	107,701,344 Ops/sec
new Array() zeroed	93,331,232 Ops/sec
[] + length	91,637,984 Ops/sec
Array.from()	903,697 Ops/sec
Array.from zeroes	818,760 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)