Run results for: reduce vs foreach with destructuring

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Reduce	6410.7 Ops/sec
Foreach	73285.0 Ops/sec

Script Preparation code:

var data = [];
for (var iterator = 0; iterator < 1000; iterator++) {
	data.push({id: iterator, name: 'Iteration ' + iterator});
}

Tests:

Reduce
var flattened = data.reduce((entities, item) => { return { ...entities, [item.id]: item } }, {}); console.log(flattened);
Foreach
var flattened = {}; data.forEach((item) => { flattened[item.id] = item; }); console.log(flattened);