Benchmark: Spread vs Object.assign

Script Preparation code:

window.object1 = {};
window.object2 = {};
window.object3 = {};
window.object4 = {};
window.object5 = {};
window.object6 = {};

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
};

function populate(object) {
  for (let i = 0; i < 100; i++) {
    object[makeid()] = makeid();
  }
};

populate(object1);
populate(object2);
populate(object3);
populate(object4);
populate(object5);
populate(object6);

Tests:

Object.assign two objects
const object7 = Object.assign({}, object1, object2);
Spread two objects
const object7 = {...object1, ...object2};
Object.assign three objects
const object7 = Object.assign({}, object1, object2, object3);
Spread three objects
const object7 = {...object1, ...object2, ...object3};
Object.assign four objects
const object7 = Object.assign({}, object1, object2, object3, object4);
Spread four objects
const object7 = {...object1, ...object2, ...object3, ...object4};
Object.assign five objects
const object7 = Object.assign({}, object1, object2, object3, object4, object5);
Spread five objects
const object7 = {...object1, ...object2, ...object3, ...object4, ...object5};
Object.assign six objects
const object7 = Object.assign({}, object1, object2, object3, object4, object5, object6);
Spread six objects
const object7 = {...object1, ...object2, ...object3, ...object4, ...object5, ...object6};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign two objects
Spread two objects
Object.assign three objects
Spread three objects
Object.assign four objects
Spread four objects
Object.assign five objects
Spread five objects
Object.assign six objects
Spread six objects

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 8 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.assign two objects	34104.9 Ops/sec
Spread two objects	26247.7 Ops/sec
Object.assign three objects	21559.8 Ops/sec
Spread three objects	18448.0 Ops/sec
Object.assign four objects	17472.6 Ops/sec
Spread four objects	12954.7 Ops/sec
Object.assign five objects	10061.9 Ops/sec
Spread five objects	10357.9 Ops/sec
Object.assign six objects	8517.8 Ops/sec
Spread six objects	8284.6 Ops/sec

Spread vs Object.assign (version: 0)

Comparing performance of: Object.assign two objects vs Spread two objects vs Object.assign three objects vs Spread three objects vs Object.assign four objects vs Spread four objects vs Object.assign five objects vs Spread five objects vs Object.assign six objects vs Spread six objects

Created: 6 years ago by: Guest

Jump to the latest result

Object.assign two objects

Spread two objects

Object.assign three objects

Spread three objects

Object.assign four objects

Spread four objects

Object.assign five objects

Spread five objects

Object.assign six objects

Spread six objects

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A