Benchmark: replaceAT - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

// Set up
const replaceAt = (str, index, character) => str.substr(0, index) + character + str.substr(index + character.length);

const replaceAt2 = (str, index, character) => {
    const chars = Array.from(str);

    chars[index] = character;
    return chars.join('');
}

const replaceAt3 = (str, index, character) => {
    const chars = str.split('');

    chars[index] = character;
    return chars.join('');
}

// Set up test variables

const str = new Array(10000).fill('0123456789').join('0123456789');

Tests:

Substr
replaceAt(str, str.length / 2, "W");
Array.from
replaceAt2(str, str.length / 2, "W");
Str.split
replaceAt3(str, str.length / 2, "W");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Substr
Array.from
Str.split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.2.1

View result in a separate tab

Substr

32.1M/s

Str.split

295/s

Array.from

223/s

View exact numbers

Test name	Executions per second
✓ Substr	32,080,596 Ops/sec
Str.split	295 Ops/sec
Array.from	223 Ops/sec

replaceAT (version: 1)

Comparing performance of: `Substr vs Array.from vs Str.split`

Created: one year ago by: Registered User

Go to the latest result

Substr

Array.from

Str.split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

replaceAT (version: 1)

Comparing performance of: Substr vs Array.from vs Str.split

Created: one year ago by: Registered User

Go to the latest result

Substr

Array.from

Str.split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Comparing performance of: `Substr vs Array.from vs Str.split`