Run results for: Object.assign vs inner for

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; M2102J20SG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.5481.192 Mobile Safari/537.36 OPR/74.1.3922.71199

Browser: Opera Mobile 74

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
object assign	2716.1 Ops/sec
Inner for loop	564.5 Ops/sec

Script Preparation code:

var queue = [];

for (let i = 0; i < 500; i++) {
    const obj = {
        id: i + 1,
        name: 'John Doe',
        age: Math.floor(Math.random() * 50) + 20,
    };

    // Add random keys with random values
    obj[`key${Math.floor(Math.random() * 50)}`] = Math.random() * 100;
    obj[`key${Math.floor(Math.random() * 50)}`] = Math.random() * 100;

    // Add some objects with repetitive keys
    if (i % 2 === 0) {
        obj.address = {
            street: '123 Main St',
            city: 'Anytown',
            state: 'CA',
            zip: '12345',
        };
    } else {
        obj.address = {
            street: '456 Oak Ave',
            city: 'Somewhere',
            state: 'NY',
            zip: '67890',
        };
    }

    queue.push(obj);
}

var existingObj = {
    id: 24,
    model: 'Ford',
}

Tests:

object assign
for (let i = 0; i < queue.length; i++) { existingObj = Object.assign(existingObj, queue[i]); }
Inner for loop
for(let i = 0; i < queue.length; i++) { for(let key in queue[i]) { if(queue[i][key] !== undefined) { existingObj[key] = queue[i][key] } } }

Run results for: Object.assign vs inner for

ASD

object assign

Inner for loop