Run results for: Array creation vs empty values

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Empty array (declared using "const")

2K/s

Re create array (declared using "let")

1K/s

View exact numbers

Test name	Executions per second
✓ Empty array (declared using "const")	1,677 Ops/sec
Re create array (declared using "let")	1,431 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();
}

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); } }