Run results for: compare the ways to generate an empty array for iteration 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Array(n).fill(0)

378K/s

Array(n).fill(null)

344K/s

[...Array(n)]

338K/s

Array.apply(null, Array(n))

228K/s

Array.from({ length: n })

41K/s

Array.from({ length:n }, (item, i) => i)

37K/s

View exact numbers

Tests:

Array.apply(null, Array(n))
Array.apply(null, Array(1000)).map((item, i) => i);
[...Array(n)]
[...Array(1000)].map((item, i) => i);
Array(n).fill(null)
Array(1000).fill(null).map((item, i) => i);
Array.from({ length: n })
Array.from({ length: 1000 }).map((item, i) => i);
Array.from({ length:n }, (item, i) => i)
Array.from({ length:1000 }, (item, i) => i);
Array(n).fill(0)
Array(1000).fill(0).map((item, i) => i);