Benchmark: Remove by splice vs copyWithin

Script Preparation code:

var array = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99]

function deleteBySplice (array, element) {
  var index = array.indexOf( element );
  if (index !== -1) {
  	array.splice( index, 1 );
  }
}

function deleteByCopyWithin (array, element) {
  var index = array.indexOf( element );
  if (index !== -1) {
  	array.copyWithin( index, index + 1 );
    --array.length;
  }
}

Tests:

Delete by Splice
deleteBySplice( array, 42 ); deleteBySplice( array, 0 ); deleteBySplice( array, 68 );
Delete by copyWithin
deleteByCopyWithin( array, 42 ); deleteByCopyWithin( array, 0 ); deleteByCopyWithin( array, 68 );

Historical Performance Data aggregated from 6 community runs

Mobile Results:

Chrome 6 runs

Delete by Splice

1.8M/s

Delete by copyWithin

1.8M/s

View exact numbers

✓ Delete by Splice: 1,781,471 ops/sec
• Delete by copyWithin: 1,764,918 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
Delete by Splice
Delete by copyWithin

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/112.0

Browser/OS: Firefox 112 on Windows

View result in a separate tab

Delete by Splice

1.6M/s

Delete by copyWithin

1.6M/s

View exact numbers

Test name	Executions per second
✓ Delete by Splice	1,617,989 Ops/sec
Delete by copyWithin	1,604,083 Ops/sec

Remove by splice vs copyWithin (version: 0)

In-place deletion of an element from an array.

Comparing performance of: `Delete by Splice vs Delete by copyWithin`

Created: 9 years ago by: Guest

Go to the latest result

Delete by Splice

Delete by copyWithin

Historical Performance Data aggregated from 6 community runs

Mobile Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Remove by splice vs copyWithin (version: 0)

In-place deletion of an element from an array.

Comparing performance of: Delete by Splice vs Delete by copyWithin

Created: 9 years ago by: Guest

Go to the latest result

Delete by Splice

Delete by copyWithin

Historical Performance Data aggregated from 6 community runs

Mobile Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Delete by Splice vs Delete by copyWithin`