Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36
Chrome 98
Windows
Desktop
2 years ago
Test name Executions per second
[...Array(n).keys()].map(k => undefined) 64.2 Ops/sec
Array.apply(null, { length: 4 }) 351.5 Ops/sec
Array.from 60.9 Ops/sec
Array(n).fill(undefined) 2524.7 Ops/sec
for loop push 55.3 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