Run results for: reduce vs foreach with destructuring and without

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Reduce	2361.9 Ops/sec
Foreach	27854.2 Ops/sec
Reduce but without destructuring	28105.1 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);
Reduce but without destructuring
var flattened = data.reduce((entities, item) => { entities[item.id] = item; return entities; }, {}); console.log(flattened);