Benchmark: concat, vs spread, vs push

HTML Preparation code:

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Script Preparation code:

/*your preparation JavaScript code goes here
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async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
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}

Tests:

concat
/*When writing async/deferred tests, use `deferred.resolve()` to mark test as done*/ a = [1,2,3]; a = a.concat([4,5,6]);
spread
a = [1,2,3]; a = [...a, ...[4,5,6]];
push
a = [1,2,3]; a.push.apply([4,5,6]);

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

push

13.7M/s

spread

6.8M/s

concat

5.4M/s

Fastest: push (2.5x faster)

View exact numbers

✓ push: 13,661,172 ops/sec
• spread: 6,754,375 ops/sec
• concat: 5,436,935 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
concat
spread
push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Linux

View result in a separate tab

push

13.6M/s

spread

6.8M/s

concat

5.5M/s

View exact numbers

Test name	Executions per second
✓ push	13,631,448 Ops/sec
spread	6,797,943 Ops/sec
concat	5,473,168 Ops/sec

concat, vs spread, vs push (version: 1)

Comparing performance of: `concat vs spread vs push`

Created: one year ago by: Guest

Go to the latest result

concat

spread

push

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

concat, vs spread, vs push (version: 1)

Comparing performance of: concat vs spread vs push

Created: one year ago by: Guest

Go to the latest result

concat

spread

push

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `concat vs spread vs push`