Run results for: new Array(length).fill().map vs Array.from({ length }, callback)

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

Array.from

68K/s

new Array + fill

37K/s

View exact numbers

Test name	Executions per second
✓ Array.from	67,548 Ops/sec
new Array + fill	37,061 Ops/sec

HTML Preparation code:

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

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}
var arr = ['', '', ''];

const ARRAY_LENGTH = 10000;

Tests:

new Array + fill
new Array(ARRAY_LENGTH).fill(0).map((_, index) => index)
Array.from
Array.from({ length: ARRAY_LENGTH }, (_, index) => index)