Run results for: replaceAT - MeasureThat.net

Run details:

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: Mobile Safari 18

Operating system: iOS 18.2.1

Device Platform: Mobile

Date tested: one year ago

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

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");