Benchmark: flatMap vs reduce with spread vs reduce with push vs for of vs push v2 ...

Script Preparation code:

var arr = Array(10_000).fill(0)

Tests:

reduce with spread
arr.reduce((acc, x) => [...acc, x], [])
flatMap
arr.flatMap(x => [x])
reduce with push
arr.reduce((acc, x) => { acc.push(x); return acc; }, [])
for...of
const acc = [] for (const x of arr) { acc.push(x); }
push(...arr)
const acc = [] acc.push(...arr);
copy via spread
const acc = [...arr];
copy via slice
const acc = arr.slice();
for i
const acc = [] const n = arr.length; for (let i = 0; i<n; i++) { acc[i] = arr[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with spread
flatMap
reduce with push
for...of
push(...arr)
copy via spread
copy via slice
for i

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

copy via slice

1.4M/s

copy via spread

110K/s

push(...arr)

64K/s

for...of

48K/s

reduce with push

36K/s

flatMap

6K/s

for i

3K/s

reduce with spread

33/s

View exact numbers

Test name	Executions per second
✓ copy via slice	1,372,809 Ops/sec
copy via spread	110,492 Ops/sec
push(...arr)	63,941 Ops/sec
for...of	48,044 Ops/sec
reduce with push	35,837 Ops/sec
flatMap	5,799 Ops/sec
for i	3,130 Ops/sec
reduce with spread	33 Ops/sec

flatMap vs reduce with spread vs reduce with push vs for of vs push v2 ... (version: 0)

Comparing performance of: `reduce with spread vs flatMap vs reduce with push vs for...of vs push(...arr) vs copy via spread vs copy via slice vs for i`

Created: 2 years ago by: Guest

Go to the latest result

reduce with spread

flatMap

reduce with push

for...of

push(...arr)

copy via spread

copy via slice

for i

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

flatMap vs reduce with spread vs reduce with push vs for of vs push v2 ... (version: 0)

Comparing performance of: reduce with spread vs flatMap vs reduce with push vs for...of vs push(...arr) vs copy via spread vs copy via slice vs for i

Created: 2 years ago by: Guest

Go to the latest result

reduce with spread

flatMap

reduce with push

for...of

push(...arr)

copy via spread

copy via slice

for i

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `reduce with spread vs flatMap vs reduce with push vs for...of vs push(...arr) vs copy via spread vs copy via slice vs for i`