Run results for: Merge objects with spread vs foreach & new

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser: Chrome 115

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Spread object

20.1M/s

forEach & new

6.0M/s

View exact numbers

Test name	Executions per second
✓ Spread object	20,076,260 Ops/sec
forEach & new	5,960,717 Ops/sec

Script Preparation code:

var a = {'a': 10, 'b': 20, 'c': 30};
var b = {'b': 21, 'c': 31};

Tests:

Spread object
var c = {...a, ...b};
forEach & new
var c = {} Object.keys(a).forEach(k => c[k] = a[k]); Object.keys(b).forEach(k => c[k] = b[k]);