Run results for: Array splice vs object assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/605.1.15

Browser: Chrome 88

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

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'});
ES6 Object Spread
input = { ...input, [999]: {id: 999, data: 'somethingElse'} }
Object property assign
input[999] = {id: 999, data: 'somethingElse'}