Run results for: nested reducing

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36 Edg/106.0.1370.52

Browser: Chrome 106

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
spread	134203.0 Ops/sec
object assign	111325.7 Ops/sec

Script Preparation code:

var range = (from, to) => {
    const output = {}
    for (var x = from; x < to; x++) {
        output[x] = {
            a: x + 'a',
            b: x + 'b',
            c: x + 'c'
        }
    }
    return output
}
var newData = {
    b: 'zzzzzz'
};

Tests:

spread
const a = Object.entries(range(0, 10)).reduce((acc, [key, obj]) => { acc[key] = { ...obj, ...newData } return acc }) console.log(a)
object assign
const a = Object.entries(range(0, 10)).reduce((acc, [key, obj]) => { acc[key] = Object.assign({}, obj, newData); return acc }) console.log(a)

Run results for: nested reducing

spread

object assign