Run results for: Object.assign vs key assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Key assign	10100570.0 Ops/sec
Object.assign	3280372.0 Ops/sec

Script Preparation code:

var input = { foo: 'lorem', bar: null }

Tests:

Key assign
const { foo, bar } = input; const result = {}; if (foo) { result['foo'] = foo; } if (bar) { result['bar'] = bar; }
Object.assign
const { foo, bar } = input; const result = {}; Object.assign( foo ? { foo } : {}, bar ? { bar } : {} );