Run results for: reduce vs foreach with destructuring fork

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser: Chrome 98

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Reduce Destructuring	6093.5 Ops/sec
Reduce reusing accumulator	64168.4 Ops/sec

Script Preparation code:

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

Tests:

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