Run results for: Object.fromEntries vs reduce with keys as indexes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser: Chrome 93

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
With reduce with an id inside the object	1402141.2 Ops/sec
with Object.fromEntries ( array.map( ... ) ) with an id inside the object	935954.8 Ops/sec

Script Preparation code:

var data = [{
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}, {
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}, {
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}, {
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}, {
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}, {
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1,
    test: 1
}]

Tests:

With reduce with an id inside the object
data.reduce((previousKeys, actualKey, indexKey) => { previousKeys[ indexKey ] = { id: indexKey, order: indexKey, ...actualKey }; return previousKeys; }, {});
with Object.fromEntries ( array.map( ... ) ) with an id inside the object
Object.fromEntries(data.map((key, value) => [ value, { id: value, ...key } ]));

Run results for: Object.fromEntries vs reduce with keys as indexes

With reduce with an id inside the object

with Object.fromEntries ( array.map( ... ) ) with an id inside the object