Benchmark: Object.assign vs iteration performance (Grammarly Focal)

Object.assign vs iteration performance (Grammarly Focal) (version: 0)

Comparing performance of: Iteration with blank object vs Object.assign with blank object vs Iteration with created object vs Object.assign with created object vs Iteration with blank object and prototype vs Object.assign with blank object and prototype vs Iteration with blank object and prototype prop vs Object.assign with blank object and prototype prop

Created: 3 years ago by: Guest

Jump to the latest result

Script Preparation code:

class Rectangle {
    constructor(height, width) {
        this.height = height;
        this.width = width;
    }

    calcArea() {
        return this.height * this.width;
    }
}

var r = new Rectangle(3, 4);

Tests:

Iteration with blank object
var copy = {}; for(const prop in r) copy[prop] = r[prop];
Object.assign with blank object
var copy = {}; Object.assign(copy, r);
Iteration with created object
var copy = Object.create(Object.getPrototypeOf(r)); for(const prop in r) copy[prop] = r[prop];
Object.assign with created object
var copy = Object.create(Object.getPrototypeOf(r)); Object.assign(copy, r);
Iteration with blank object and prototype
var copy = {}; Object.setPrototypeOf(copy, Object.getPrototypeOf(r)); for(const prop in r) copy[prop] = r[prop];
Object.assign with blank object and prototype
var copy = {}; Object.setPrototypeOf(copy, Object.getPrototypeOf(r)); Object.assign(copy, r);
Iteration with blank object and prototype prop
var copy = {}; copy.__proto__ = r.__proto__; for(const prop in r) copy[prop] = r[prop];
Object.assign with blank object and prototype prop
var copy = {}; copy.__proto__ = r.__proto__; Object.assign(copy, r);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Iteration with blank object
Object.assign with blank object
Iteration with created object
Object.assign with created object
Iteration with blank object and prototype
Object.assign with blank object and prototype
Iteration with blank object and prototype prop
Object.assign with blank object and prototype prop

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; rv:72.0) Gecko/20100101 Firefox/72.0

Browser/OS: Firefox 72 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Iteration with blank object	16853190.0 Ops/sec
Object.assign with blank object	4741289.0 Ops/sec
Iteration with created object	17946060.0 Ops/sec
Object.assign with created object	5912600.0 Ops/sec
Iteration with blank object and prototype	5608727.0 Ops/sec
Object.assign with blank object and prototype	3461991.0 Ops/sec
Iteration with blank object and prototype prop	6119875.0 Ops/sec
Object.assign with blank object and prototype prop	3286556.0 Ops/sec

Object.assign vs iteration performance (Grammarly Focal) (version: 0)

Created: 3 years ago by: Guest

Jump to the latest result

Iteration with blank object

Object.assign with blank object

Iteration with created object

Object.assign with created object

Iteration with blank object and prototype

Object.assign with blank object and prototype

Iteration with blank object and prototype prop

Object.assign with blank object and prototype prop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A