Run results for: for...in vs for...of

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

7K/s

6K/s

View exact numbers

Test name	Executions per second
✓ of	6,714 Ops/sec
in	6,219 Ops/sec

HTML Preparation code:

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

Script Preparation code:

function removeIdNewV2(value) {
    if ('_id' in value) {
        delete value._id;
    }

    const iterator = Array.isArray(value) ? value : Object.keys(value);
    for (const iteratee of iterator) {
        const element = value[iteratee] ?? iteratee;

        if (typeof element === 'object') {
            removeIdNewV2(element);
        }
    }
}

function removeIdOldV3(value) {
    if ('_id' in value) {
        delete value._id;
    }
    for (const objectKey in value) {
        var element = value[objectKey];
        if (typeof element === 'object') {
            removeIdOldV3(element);
        }
    }
}

function getRandom(min, max) {
  return ~~(Math.random() * (max - min + 1) + min);
}

function setId(pointer, counter) {
    if (getRandom(1, 2) % 2) {
        pointer._id = 'randomId';
    }
    if (counter < 1000) {
        pointer['deeper'] = {};
        setId(pointer['deeper'], ++counter);
    }
}

var element = {};

Tests:

of
setId(element, 0); removeIdNewV2(element);
in
setId(element, 0); removeIdOldV3(element);