Benchmark: Merge objects with spread vs foreach & new

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]);

Rendered benchmark preparation results:

Previous results

Test case name	Result
Spread object
forEach & new

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Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

Test name	Executions per second
Spread object	8129641.0 Ops/sec
forEach & new	1490761.0 Ops/sec

Merge objects with spread vs foreach & new (version: 0)