Run results for: Object.assign vs SPREAD

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36 Edg/106.0.1370.34

Browser: Chrome 106

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object assign	4305.2 Ops/sec
SPREAD	3377.7 Ops/sec

Script Preparation code:

var foo = {};
for (var i=0;i<100;i++) {
    foo['foo'+i] = i;
    foo['foobar'+i] = i;
}

var bar = {};
for (var i=0;i<100;i++) {
    bar['bar'+i] = i;
    bar['foobar'+i] = i;
}

Tests:

Object assign
console.log(Object.assign({}, foo, bar));
SPREAD
console.log({...foo, ...bar});

Run results for: Object.assign vs SPREAD

Object assign

SPREAD