Benchmark: Map vs Object reduce - MeasureThat.net

Script Preparation code:

var arr = Array.from({
    length: 1000
}, (_, i) => i);

Tests:

Map
arr.reduce((map, i) => map.set(i, i), new Map());
Object assignment
arr.reduce((obj, i) => { obj[i] = i; return obj; }, {});
Object spread
arr.reduce((obj, i) => ({ ...obj, [i]: i }), {});
Object.assign
arr.reduce((obj, i) => Object.assign(obj, { [i]: i }), {});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Object assignment
Object spread
Object.assign

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.151 Safari/537.36

Browser/OS: Chrome 88 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Map	21168.3 Ops/sec
Object assignment	53869.6 Ops/sec
Object spread	3651.3 Ops/sec
Object.assign	456.1 Ops/sec