Benchmark: String character looping

HTML Preparation code:

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

Script Preparation code:

function generateRandomString(length) {
  const randomValues = new Uint8Array(length);
  window.crypto.getRandomValues(randomValues);
  const randomChars = Array.from(randomValues, (value) => String.fromCharCode(value));
  return randomChars.join('');
}

const text = generateRandomString(1000);
console.log({ text })

Tests:

String.prototype.at
const chars = [] for (let i = 0; i < text.length; i++) { chars.push(text.at(i)) } console.log(chars)
String.prototype.charAt
const chars = [] for (let i = 0; i < text.length; i++) { chars.push(text.charAt(i)) } console.log(chars)
String.prototype.split
const chars = text.split('') console.log(chars)
String.prototype.substring
const chars = [] for (let i = 0; i < text.length; i++) { chars.push(text.substring(i, i+1)) } console.log(chars)
String.prototype.slice
const chars = [] for (let i = 0; i < text.length; i++) { chars.push(text.slice(i, i+1)) } console.log(chars)
for-loop
const chars = []; for (let i = 0; i < text.length; i++) { chars.push(text[i]); } console.log(chars)
spread operator
const chars = [...text] console.log(chars)
Array.from
const chars = Array.from(text) console.log(chars)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String.prototype.at
String.prototype.charAt
String.prototype.split
String.prototype.substring
String.prototype.slice
for-loop
spread operator
Array.from

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/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

String.prototype.split

21K/s

spread operator

20K/s

Array.from

20K/s

String.prototype.charAt

18K/s

for-loop

18K/s

String.prototype.substring

17K/s

String.prototype.slice

17K/s

String.prototype.at

17K/s

View exact numbers

Test name	Executions per second
✓ String.prototype.split	21,103 Ops/sec
spread operator	20,021 Ops/sec
Array.from	19,964 Ops/sec
String.prototype.charAt	17,656 Ops/sec
for-loop	17,532 Ops/sec
String.prototype.substring	17,361 Ops/sec
String.prototype.slice	17,354 Ops/sec
String.prototype.at	17,054 Ops/sec

String character looping (version: 1)

Loop through the characters of a string

Comparing performance of: `String.prototype.at vs String.prototype.charAt vs String.prototype.split vs String.prototype.substring vs String.prototype.slice vs for-loop vs spread operator vs Array.from`

Created: one year ago by: Registered User

Go to the latest result

String.prototype.at

String.prototype.charAt

String.prototype.split

String.prototype.substring

String.prototype.slice

for-loop

spread operator

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

String character looping (version: 1)

Loop through the characters of a string

Comparing performance of: String.prototype.at vs String.prototype.charAt vs String.prototype.split vs String.prototype.substring vs String.prototype.slice vs for-loop vs spread operator vs Array.from

Created: one year ago by: Registered User

Go to the latest result

String.prototype.at

String.prototype.charAt

String.prototype.split

String.prototype.substring

String.prototype.slice

for-loop

spread operator

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `String.prototype.at vs String.prototype.charAt vs String.prototype.split vs String.prototype.substring vs String.prototype.slice vs for-loop vs spread operator vs Array.from`