Run results for: Array.from({ length }) vs new Array()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36

Browser: Chrome 151

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 29 days ago

Benchmark engine: Benchmark.js

new Array(length)

567/s

new Array(length) (index fill)

44/s

Array.from({ length })

6/s

Array.from({ length }) (index fill)

6/s

View exact numbers

Test name	Executions per second
✓ new Array(length)	567 Ops/sec
new Array(length) (index fill)	44 Ops/sec
Array.from({ length })	6 Ops/sec
Array.from({ length }) (index fill)	6 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();
}

Tests:

Array.from({ length })
Array.from({ length: 10000000 })
new Array(length)
new Array(10000000)
Array.from({ length }) (index fill)
Array.from({ length: 10000000 }, (_, idx) => idx);
new Array(length) (index fill)
new Array(10000000).map((_, idx) => idx)