Benchmark: Array creation vs empty values

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();
}

function isPrime(num) {
    for (let i = 2, s = Math.sqrt(num); i <= s; i++) {
        if (num % i === 0) {
            return false;
        }
    }
    return num > 1;
}

Tests:

Re create array (declared using "let")
const size = 10000; let primeNumbers = []; for (var i = 0; i < size; i++) { if (isPrime(i)) { primeNumbers.push(i); } if (primeNumbers.length > 10) { primeNumbers = []; } }
Empty array (declared using "const")
const size = 10000; const primeNumbers = []; for (var i = 0; i < size; i++) { if (isPrime(i)) { primeNumbers.push(i); } if (primeNumbers.length > 10) { primeNumbers.splice(0, primeNumbers.length); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Re create array (declared using "let")
Empty array (declared using "const")

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Re create array (declared using "let")

3K/s

Empty array (declared using "const")

3K/s

View exact numbers

Test name	Executions per second
✓ Re create array (declared using "let")	2,973 Ops/sec
Empty array (declared using "const")	2,893 Ops/sec

Array creation vs empty values (version: 1)

Comparing performance of: `Re create array (declared using "let") vs Empty array (declared using "const")`

Created: one year ago by: Guest

Go to the latest result

Re create array (declared using "let")

Empty array (declared using "const")

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Array creation vs empty values (version: 1)

Comparing performance of: Re create array (declared using "let") vs Empty array (declared using "const")

Created: one year ago by: Guest

Go to the latest result

Re create array (declared using "let")

Empty array (declared using "const")

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Re create array (declared using "let") vs Empty array (declared using "const")`