Benchmark: JS loops and iterators + reverse

Script Preparation code:

var array = new Array(1000).fill(Math.random(1000) * 1000);

Tests:

Classic for loop
let sum = 0; for (let i=0; i < array.length; i++) { sum += array[i]; }
Optimised classic for loop
let sum = 0; for (let i=0, len=array.length; i < len; i++) { sum += array[i]; }
While loop
let sum = 0; let i = 0; while (i < array.length) { sum += array[i]; i++; }
Optimised while loop
let sum = 0; let i = 0; let len = array.length; while (i < len) { sum += array[i]; i++; }
Array.prototype.forEach
let sum = 0; array.forEach(num => sum += num);
Array.prototype.reduce
const sum = array.reduce((acc, el) => acc + el, 0);
For - of loop
let sum = 0; for (let el of array) { sum += el; }
For - in loop
let sum = 0; for (let i in array) { sum += array[i]; }
For - reverse loop
let sum = 0; for (let i=array.length - 1; i >= 0; i--) { sum += array[i]; }
while - reverse loop
let sum = 0; let i = array.length - 1; while (i >= 0) { sum += array[i]; i--; }

Historical Performance Data aggregated from 3,560 community runs

Desktop Results:

Chrome 3,560 runs

MmzHrrdb

1/s

-1 OR 5*5=25 --

1/s

-1 OR 5*5=25

1/s

-1' OR 5*5=25 --

1/s

-1" OR 5*5=25 --

1/s

if(now()=sysdate(),sleep(15),0)

1/s

MmzHrrdb0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z

1/s

MmzHrrdb0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z

1/s

(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/

1/s

MmzHrrdb-1; waitfor delay '0:0:15' --

1/s

MmzHrrdb-1); waitfor delay '0:0:15' --

1/s

MmzHrrdb-1 waitfor delay '0:0:15' --

1/s

MmzHrrdb'||DBMS_PIPE.RECEIVE_MESSAGE(CHR(98)||CHR(98)||CHR(98),15)||'

1/s

MmzHrrdb'"

1/s

MmzHrrdb%C0%A7%C0%A2%2527%2522\'\"

1/s

(select 198766*667891)

1/s

(select 198766*667891 from DUAL)

1/s

View exact numbers

✓ MmzHrrdb: 1 ops/sec
• -1 OR 5*5=25 -- : 1 ops/sec
• -1 OR 5*5=25: 1 ops/sec
• -1' OR 5*5=25 -- : 1 ops/sec
• -1" OR 5*5=25 -- : 1 ops/sec
• if(now()=sysdate(),sleep(15),0): 1 ops/sec
• MmzHrrdb0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z: 1 ops/sec
• MmzHrrdb0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z: 1 ops/sec
• (select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/: 1 ops/sec
• MmzHrrdb-1; waitfor delay '0:0:15' -- : 1 ops/sec
• MmzHrrdb-1); waitfor delay '0:0:15' -- : 1 ops/sec
• MmzHrrdb-1 waitfor delay '0:0:15' -- : 1 ops/sec
• MmzHrrdb'||DBMS_PIPE.RECEIVE_MESSAGE(CHR(98)||CHR(98)||CHR(98),15)||': 1 ops/sec
• MmzHrrdb'": 1 ops/sec
• MmzHrrdb%C0%A7%C0%A2%2527%2522\'\": 1 ops/sec
• (select 198766*667891): 1 ops/sec
• (select 198766*667891 from DUAL): 1 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Classic for loop
Optimised classic for loop
While loop
Optimised while loop
Array.prototype.forEach
Array.prototype.reduce
For - of loop
For - in loop
For - reverse loop
while - reverse loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Windows

View result in a separate tab

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

MmzHrrdb

1/s

View exact numbers

Test name	Executions per second
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec
✓ MmzHrrdb	1 Ops/sec

JS loops and iterators + reverse (version: 1)

Comparing speed of JavaScript loops

Comparing performance of: `Classic for loop vs Optimised classic for loop vs While loop vs Optimised while loop vs Array.prototype.forEach vs Array.prototype.reduce vs For - of loop vs For - in loop vs For - reverse loop vs while - reverse loop`

Created: one month ago by: Guest

Go to the latest result

Classic for loop

Optimised classic for loop

While loop

Optimised while loop

Array.prototype.forEach

Array.prototype.reduce

For - of loop

For - in loop

For - reverse loop

while - reverse loop

Historical Performance Data aggregated from 3,560 community runs

Desktop Results:

Chrome 3,560 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

JS loops and iterators + reverse (version: 1)

Comparing speed of JavaScript loops

Comparing performance of: Classic for loop vs Optimised classic for loop vs While loop vs Optimised while loop vs Array.prototype.forEach vs Array.prototype.reduce vs For - of loop vs For - in loop vs For - reverse loop vs while - reverse loop

Created: one month ago by: Guest

Go to the latest result

Classic for loop

Optimised classic for loop

While loop

Optimised while loop

Array.prototype.forEach

Array.prototype.reduce

For - of loop

For - in loop

For - reverse loop

while - reverse loop

Historical Performance Data aggregated from 3,560 community runs

Desktop Results:

Chrome 3,560 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Classic for loop vs Optimised classic for loop vs While loop vs Optimised while loop vs Array.prototype.forEach vs Array.prototype.reduce vs For - of loop vs For - in loop vs For - reverse loop vs while - reverse loop`