Benchmark: js array copy speed comparison with spread operator

Tests:

map
const arr = [1,2,3,4,5] const newArr = arr.map(e=>e)
array.from
const arr = [1,2,3,4,5] const newArr = Array.from(arr)
for loop
const arr = [1,2,3,4,5] let newArr = []; for(let i = 0; i < arr.length; i++) { newArr[i] = arr[i]; }
foreach
const arr = [1,2,3,4,5] let newArr = [] arr.forEach(e => { newArr.push(e) })
slice
const arr = [1,2,3,4,5] const newArr = arr.slice()
spread
const arr = [1,2,3,4,5] const newArr = [...arr]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
array.from
for loop
foreach
slice
spread

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser/OS: Chrome 145 on Mac OS X 10.15.7

View result in a separate tab

slice

63.7M/s

spread

54.5M/s

array.from

47.7M/s

for loop

26.3M/s

foreach

21.6M/s

map

12.1M/s

View exact numbers

Test name	Executions per second
✓ slice	63,667,248 Ops/sec
spread	54,464,016 Ops/sec
array.from	47,741,420 Ops/sec
for loop	26,284,214 Ops/sec
foreach	21,607,250 Ops/sec
map	12,130,138 Ops/sec

js array copy speed comparison with spread operator (version: 0) Benchmark.js

Comparing performance of: `map vs array.from vs for loop vs foreach vs slice vs spread`

Created: 2 years ago by: Guest

Go to the latest result

map

array.from

for loop

foreach

slice

spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

js array copy speed comparison with spread operator (version: 0) Benchmark.js

Comparing performance of: map vs array.from vs for loop vs foreach vs slice vs spread

Created: 2 years ago by: Guest

Go to the latest result

map

array.from

for loop

foreach

slice

spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Comparing performance of: `map vs array.from vs for loop vs foreach vs slice vs spread`