Run results for: Object.assign vs SPREAD

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0

Browser: Firefox 59

Operating system: Windows

Device Platform: Other

Date tested: 2025 years ago

Test name	Executions per second
Object assign	9039.1 Ops/sec
SPREAD	5875.3 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