Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36
Chrome 101
Linux
Desktop
2 years ago
Test name Executions per second
[...Array(n).keys()].map(k => undefined) 38.0 Ops/sec
Array.apply(null, { length: 4 }) 188.9 Ops/sec
Array.from 29.5 Ops/sec
Array(n).fill(undefined) 1670.7 Ops/sec
for loop push 29.0 Ops/sec
Script Preparation code:
Tests:
  • [...Array(n).keys()].map(k => undefined)

  • Array.apply(null, { length: 4 })

  • Array.from

  • Array(n).fill(undefined)

  • for loop push