Benchmark: Class vs Function

Tests:

Class
class A { x = 0; y = 0; }; for(let i = 0; i < 1000; i++) { let a = new A(); }
Function
function A () { this.x = 0; this.y = 0; } for (let i = 1; i < 1000; i++) { let a = new A(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Class
Function

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 27 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser/OS: Firefox 120 on Linux

View result in a separate tab

Test name	Executions per second
Class	10000.0 Ops/sec
Function	23456.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is a fascinating topic.

**Benchmark Overview**

The benchmark measures the performance difference between creating objects using classes (inherited from JavaScript's prototype-based object creation) and functions in JavaScript. The test case consists of two scripts:

1. **Class Script**: Creates an instance of class `A` 1000 times using the `new` keyword.
2. **Function Script**: Creates an instance of function `A` 1000 times without using `new`.

**Options Compared**

The benchmark compares the performance of these two approaches:

*   **Class-based object creation**: Using classes with inheritance to create objects.
*   **Function-based object creation**: Creating functions directly and then creating instances from them.

**Pros and Cons**

*   **Class-based approach**:
    *   Pros: Classes provide a more structured way of organizing code, allowing for easier reuse and encapsulation. They also support inheritance, which can be useful in complex scenarios.
    *   Cons: Class-based object creation can lead to slower performance due to the overhead of creating a class and its prototype chain. Additionally, classes are only available in ECMAScript 2015 (ES6) and later versions.
*   **Function-based approach**:
    *   Pros: Function-based object creation is generally faster since it doesn't involve the overhead of creating a class and its prototype chain. This makes it suitable for simple use cases or when performance is critical.
    *   Cons: The function-based approach does not support inheritance and can make code harder to read and maintain.

**Library and Special JS Feature**

Neither of these approaches uses any external libraries, but the `new` keyword used in both scripts relies on a special JavaScript feature called "prototype chain" or " prototype-based object creation".

Prototype-based object creation is a mechanism in JavaScript where an object's properties are inherited from its prototype (the object that it inherits from). In the case of class-based object creation, classes use this mechanism to create instances.

The `new` keyword used in both scripts creates a new instance by calling the constructor function and setting up the prototype chain. This process is optimized for performance and allows for efficient inheritance.

**Other Alternatives**

If you're looking for alternative ways to measure JavaScript performance or optimize object creation, consider:

*   **Object creation using `Object.create()`**: This method can be faster than class-based or function-based object creation.
*   **Using a library like Benchmark.js**: This is a popular benchmarking library that provides a more extensive set of features and tools for measuring performance in JavaScript.

Keep in mind that the best approach depends on your specific use case, the complexity of your code, and the requirements of your project.

Related benchmarks:

Class vs Function (version: 0)

Comparing performance of: Class vs Function

Created: 3 years ago by: Guest

Jump to the latest result

Class

Function

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):