MeasureThat.net

Run results for: Array creation vs empty values

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Run details:
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
Chrome 133
Mac OS X 10.15.7
Desktop
23 days ago
Test name Executions per second
Re create array (declared using "let") 2973.2 Ops/sec
Empty array (declared using "const") 2892.5 Ops/sec
HTML Preparation code:
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1
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Script Preparation code:
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/*your preparation JavaScript code goes here
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async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
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​
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);
      }
    }