Benchmark: Test array concat with larger array

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

copy
var getConcatenation = function(nums) { let ans = []; for (i = 0; i < nums.length; i++) { ans[i] = nums[i]; ans[i + nums.length] = nums[i]; } return ans; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
concat
var getConcatenation = function (nums) { return nums.concat(nums); }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
in place
var getConcatenation = function(nums) { const len = nums.length; for (i = 0; i < len; i++) { nums[i + len] = nums[i]; } return nums; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
Spread operator
/** * @param {number[]} nums * @return {number[]} */ var getConcatenation = function (nums) { return [...nums, ...nums]; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
copy
concat
in place
Spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

concat

3/s

Spread operator

2/s

in place

2/s

copy

1/s

View exact numbers

Test name	Executions per second
✓ concat	3 Ops/sec
Spread operator	2 Ops/sec
in place	2 Ops/sec
copy	1 Ops/sec

Test array concat with larger array (version: 2)

Comparing performance of: `copy vs concat vs in place vs Spread operator`

Created: one year ago by: Registered User

Go to the latest result

copy

concat

in place

Spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Test array concat with larger array (version: 2)

Comparing performance of: copy vs concat vs in place vs Spread operator

Created: one year ago by: Registered User

Go to the latest result

copy

concat

in place

Spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `copy vs concat vs in place vs Spread operator`