Run results for: Object.assign vs for in vs Object.entries+for of vs spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4186.0 Safari/537.36

Browser: Chrome 86

Operating system: Mac OS X 10.15.5

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Object.assign	2707525.0 Ops/sec
for in	1252870.8 Ops/sec
Object.keys + for of	1033616.8 Ops/sec
spread	10484544.0 Ops/sec

Script Preparation code:

var obj = {
  officeIpAddresses: [],
  customDomainHasUpdatedDns: false,
  stylePermissions: {
    styleAccess: {
      block: true,
      text: true,
      css: true,
      toolbar: true,
      motion: true,
    },
    editStyle: false,
  },
  permissions: {
    userInvitePermission: "test",
    defaultProjectAccess: "none",
  },
  notifications: {
    subscriptions: [],
    projectFirstOpen: true,
  },
  modules: {
    quote: {
    },
  },
};

Tests:

Object.assign
let newObj = Object.assign({}, obj)
for in
let newObj = {} for(let key in obj) { newObj[key] = obj[key] }
Object.keys + for of
let newObj = {} for(let key of Object.keys(obj)) { newObj[key] = obj[key] }
spread
let newObj = {...obj}

Run results for: Object.assign vs for in vs Object.entries+for of vs spread

Object.assign

for in

Object.keys + for of

spread