Run results for: Another Object.assign vs spread operator

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/74.0.3729.121 Mobile/15E148 Safari/605.1

Browser: Chrome Mobile iOS 74

Operating system: iOS 12.2

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Object.assign	464748.8 Ops/sec
spread operator	200907.7 Ops/sec

Tests:

Object.assign
var params = { open: true, onToggle: { mockConstructor() { }, mock() { }, mockClear() { }, mockReset() { }, mockRestore() { }, mockReturnValueOnce() { }, mockResolvedValueOnce() { }, mockRejectedValueOnce() { }, mockReturnValue() { }, mockResolvedValue() { }, mockRejectedValue() { }, mockImplementationOnce() { }, mockImplementation() { }, mockReturnThis() { }, mockName() { }, getMockName() { } }, children: { type: 'div', key: null, ref: null, props: { children: 'children' }, _owner: null, _store: { } }, dataTrackClick: 'dataTrackClick', dataTrackId: 'dataTrackId', noBodyScroll: true }; var other = Object.assign({}, params, { open: false });
spread operator
var params = { open: true, onToggle: { mockConstructor() { }, mock() { }, mockClear() { }, mockReset() { }, mockRestore() { }, mockReturnValueOnce() { }, mockResolvedValueOnce() { }, mockRejectedValueOnce() { }, mockReturnValue() { }, mockResolvedValue() { }, mockRejectedValue() { }, mockImplementationOnce() { }, mockImplementation() { }, mockReturnThis() { }, mockName() { }, getMockName() { } }, children: { type: 'div', key: null, ref: null, props: { children: 'children' }, _owner: null, _store: { } }, dataTrackClick: 'dataTrackClick', dataTrackId: 'dataTrackId', noBodyScroll: true }; var other = { ...params, open: false };