Benchmark: NodeList For vs Foreach

Script Preparation code:

var div = document.createElement('div');
for (let i = 0; i < 1000; i++) {
    div.insertAdjacentHTML('beforeend', `<span>span-${i}<span>`);
}

var list = div.querySelectorAll('span');

Tests:

Default For
for(let i = 0; i < list.length; i++) { list[i].setAttribute('tabindex', '-1'); }
For with length caching
list.forEach(item =>{ item.setAttribute('tabindex', '-1'); });
forEach
for(let i = 0, lenght = list.lenght ; i < length; i++) { list[i].setAttribute('tabindex', '-1'); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Default For
For with length caching
forEach

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 6 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Windows

View result in a separate tab

Test name	Executions per second
Default For	491.4 Ops/sec
For with length caching	544.0 Ops/sec
forEach	1378138.0 Ops/sec

NodeList For vs Foreach (version: 0)

Comparing performance of: Default For vs For with length caching vs forEach

Created: 3 years ago by: Guest

Jump to the latest result

Default For

For with length caching

forEach

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A