for vs foreach vs for..in vs for..of jul 2025 (version: 1)

Compare loop performance

Comparing performance of: for vs foreach vs for in vs for..of

Created: one year ago by: Guest
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Script Preparation code:
Tests:

Historical Performance Data aggregated from 12 community runs

Desktop Results:
Chrome 7 runs
for..of
2.9M/s
for in
1.6M/s
foreach
1.2M/s
for
520K/s

Fastest: for..of (5.6x faster)

View exact numbers
  • ✓ for..of: 2,892,142 ops/sec
  • • for in: 1,638,315 ops/sec
  • • foreach: 1,194,324 ops/sec
  • • for: 519,905 ops/sec
Firefox 5 runs
for in
80.6M/s
for
1.6M/s
foreach
1.1M/s
for..of
323K/s

Fastest: for in (249.2x faster)

View exact numbers
  • ✓ for in: 80,563,456 ops/sec
  • • for: 1,574,301 ops/sec
  • • foreach: 1,140,244 ops/sec
  • • for..of: 323,251 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
    for
    foreach
    for in
    for..of

    Fastest: N/A

    Slowest: N/A

Latest run results:
Run details: (Test run date: 4 months ago)
Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0
Firefox 148 on Linux
View result in a separate tab
for in
80.6M/s
for
1.9M/s
foreach
834K/s
for..of
335K/s
View exact numbers
Test name Executions per second
✓ for in 80,563,456 Ops/sec
for 1,920,499 Ops/sec
foreach 833,871 Ops/sec
for..of 334,643 Ops/sec

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