Benchmark: Object.assign vs defineProperties vs setPrototypeOf vs extends Function vs defineProperty

Tests:

Object.assign
let f = ()=>0 Object.assign(f, { _foo: null, get foo() {return this._foo}, set foo(_foo) {this._foo = _foo}, })
defineProperties
let f = ()=>0 Object.defineProperties(f, { foo: { value: null, writable: true } })
setPrototypeOf
let f = ()=>0 Object.setPrototypeOf(f, { ...Function.prototype, _foo: null, get foo() {return this._foo}, set foo(_foo) {this._foo = _foo}, })
extends Function
class F extends Function { constructor() { super('return 0') } _foo = null get foo() {return this._foo} set foo(_foo) {this._foo = _foo} }
defineProperty
let f = ()=>0 f._foo = null Object.defineProperty(f, 'foo', { get() { return this._foo }, set(_foo) { this._foo = _foo } })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
defineProperties
setPrototypeOf
extends Function
defineProperty

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.assign	2120007.2 Ops/sec
defineProperties	4698954.5 Ops/sec
setPrototypeOf	1463592.2 Ops/sec
extends Function	1397866.1 Ops/sec
defineProperty	5110781.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

**Overview**

The provided benchmark compares the performance of four different approaches to set properties on an object:

1. `Object.assign`
2. `defineProperties`
3. `setPrototypeOf` (combined with object property definition)
4. `extends Function` (using a class-based approach)

These approaches aim to achieve similar results, but with varying levels of overhead and complexity.

**Approach 1: Object.assign**

`Object.assign` is a method that copies properties from one or more source objects to a target object. In this benchmark, it's used to set properties on an object by assigning the new values to the existing object.

Pros:

* Simple and concise syntax
* Fast execution

Cons:

* May not work correctly with inherited properties
* Can be slower due to unnecessary property assignments

**Approach 2: defineProperties**

`defineProperties` is a method that allows defining properties on an object at creation time. In this benchmark, it's used to set properties by defining the property descriptor.

Pros:

* Flexible and customizable property definitions
* Fast execution for simple cases

Cons:

* Can be slower for complex property definitions
* May require more memory due to internal data structures

**Approach 3: setPrototypeOf**

`setPrototypeOf` is a method that sets the prototype of an object. In this benchmark, it's used in combination with `Object.defineProperty` to set properties on an object.

Pros:

* Efficient use of memory and CPU resources
* Works correctly with inherited properties

Cons:

* Can be slower for large objects due to recursive property lookup
* Requires careful configuration to achieve optimal performance

**Approach 4: extends Function**

The `extends Function` approach uses a class-based approach to define the object. The `F` class is defined as an extension of the `Function` class, and properties are set using instance methods.

Pros:

* Can be faster for large objects due to method call optimization
* Works correctly with inherited properties

Cons:

* Requires more memory due to the creation of a new class
* More complex syntax and setup required

**Other Considerations**

* Memory usage: `setPrototypeOf` and `extends Function` approaches may require more memory due to internal data structures.
* CPU resources: All approaches can be affected by CPU resources, especially for large objects or complex property definitions.
* Browser support: Firefox 128 is the target browser in this benchmark. Other browsers might have different behavior or support for these methods.

**Alternative Approaches**

Other alternatives could include:

* Using a library like Lodash or Underscore.js to provide a unified API for property manipulation
* Implementing a custom property setter using WebAssembly (WASM) or other performance-oriented languages
* Using a more modern approach, such as using the `Object` prototype's `setPrototypeOf` method directly.

Keep in mind that this is just an overview of the different approaches. The actual implementation and choice of approach depend on specific requirements and constraints.

Related benchmarks:

Object.assign vs defineProperties vs setPrototypeOf vs extends Function vs defineProperty (version: 2)

Comparing performance of: Object.assign vs defineProperties vs setPrototypeOf vs extends Function vs defineProperty

Created: one year ago by: Registered User

Jump to the latest result

Object.assign

defineProperties

setPrototypeOf

extends Function

defineProperty

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):