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

Object.assign vs iteration performance, more props (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 Thing {
    constructor() {
        this.a1 = Math.random();
        this.a2 = Math.random();
        this.a3 = Math.random();
        this.a4 = Math.random();
        this.a5 = Math.random();
        this.a6 = Math.random();
        this.a7 = Math.random();
        this.a8 = Math.random();
        this.a9 = Math.random();
        this.aa = Math.random();
        this.ab = Math.random();
    }
}

var r = new Thing();

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 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Iteration with blank object	857257.9 Ops/sec
Object.assign with blank object	2311630.0 Ops/sec
Iteration with created object	662647.1 Ops/sec
Object.assign with created object	1338702.0 Ops/sec
Iteration with blank object and prototype	639820.2 Ops/sec
Object.assign with blank object and prototype	1236175.0 Ops/sec
Iteration with blank object and prototype prop	724507.6 Ops/sec
Object.assign with blank object and prototype prop	1597629.0 Ops/sec

Object.assign vs iteration performance, more props (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