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/65.0.3325.181 Safari/537.36

Browser: Chrome 65

Operating system: Windows

Device Platform: Other

Date tested: 2025 years ago

Test name	Executions per second
Object assign	3417.6 Ops/sec
SPREAD	3155.0 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