Run results for: Map vs Object reduce - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Map	8632.3 Ops/sec
Object assignment	24653.3 Ops/sec
Object spread	2001.2 Ops/sec
Object.assign	268.0 Ops/sec

Website performance monitoring

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 }), {});