Run results for: Object.assisn vs Spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object.assign	185604.8 Ops/sec
Spread	87089.6 Ops/sec

Script Preparation code:

var A = {
  name: 'John', 
  age: 20, 
  job: 'developer'
};

var B = {
  email: 'test@test.com', 
  address: 'Seoul', 
  job: 'doctor'
};

​x
 
var A = {  name: 'John',   age: 20,   job: 'developer'};​var B = {  email: 'test@test.com',   address: 'Seoul',   job: 'doctor'};

Tests:

var result = Object.assign({}, A, B);
console.log(result)

 
var result = Object.assign({}, A, B);console.log(result)                        

var result = {...{}, ...A, ...B};
console.log(result)

 
var result = {...{}, ...A, ...B};console.log(result)                        