Benchmark: startsWith vs include vs substring vs Array.from

Script Preparation code:

window.prefix = "!";
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

function makeRandomString(len) {
  var text = "";
  for( var i=0; i < len; i++ ) {
    text += possible.charAt(getRandomInt(possible.length));
  }
  return text;
}

window.allStrings = [];
for (let i = 0; i < 1000; i++) {
	allStrings.push(window.prefix + makeRandomString(1000));
	allStrings.push(makeRandomString(1000));
}

Tests:

JS startsWith
window.allStrings.forEach(s => { s.startsWith(window.prefix); })
JS includes
window.allStrings.forEach(s => { s.includes(window.prefix); })
JS substring
window.allStrings.forEach(s => { s.substring(0, window.prefix.length) === window.prefix; })
Array.from
window.allStrings.forEach(s => { Array.from(s)[0] === window.prefix; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JS startsWith
JS includes
JS substring
Array.from

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:146.0) Gecko/20100101 Firefox/146.0

Browser/OS: Firefox 146 on Mac OS X 10.15

View result in a separate tab

JS includes

7K/s

JS startsWith

6K/s

JS substring

3K/s

Array.from

107/s

View exact numbers

Test name	Executions per second
✓ JS includes	6,617 Ops/sec
JS startsWith	6,011 Ops/sec
JS substring	3,304 Ops/sec
Array.from	107 Ops/sec

startsWith vs include vs substring vs Array.from (version: 1)

Comparing performance of: `JS startsWith vs JS includes vs JS substring vs Array.from`

Created: one year ago by: Guest

Go to the latest result

JS startsWith

JS includes

JS substring

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

startsWith vs include vs substring vs Array.from (version: 1)

Comparing performance of: JS startsWith vs JS includes vs JS substring vs Array.from

Created: one year ago by: Guest

Go to the latest result

JS startsWith

JS includes

JS substring

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `JS startsWith vs JS includes vs JS substring vs Array.from`