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: 4 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

Test name	Executions per second
JS startsWith	6010.9 Ops/sec
JS includes	6616.9 Ops/sec
JS substring	3303.6 Ops/sec
Array.from	107.4 Ops/sec

Related benchmarks:

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

Jump to the latest result

JS startsWith

JS includes

JS substring

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A