Benchmark: javascript replaceAt

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");
Array.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
Array.split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Substr

29.6M/s

Array.split

117/s

Array.from

110/s

View exact numbers

Test name	Executions per second
✓ Substr	29,616,630 Ops/sec
Array.split	117 Ops/sec
Array.from	110 Ops/sec

javascript replaceAt (version: 2)

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

Created: one year ago by: Registered User

Go to the latest result

Substr

Array.from

Array.split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

javascript replaceAt (version: 2)

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

Created: one year ago by: Registered User

Go to the latest result

Substr

Array.from

Array.split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

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