Run results for: Array splice vs array assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0

Browser: Chrome 145

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Array splice	1160236.5 Ops/sec
Object property assign	1193873.4 Ops/sec

Script Preparation code:

var input = [];
for (var i = 0; i < 50000; i++) {
    input.push({
        id: i,
        data: 'something'
    })
}

Tests:

Array splice
const index = input.findIndex(val => val.id === 999); input.splice(index, 1, {id: 999, data: 'somethingElse'});
Object property assign
const index = input.findIndex(val => val.id === 999); input[index] = {id: 999, data: 'somethingElse'}