Benchmark: new class vs function returning obj

HTML Preparation code:

<script>
class TestClass {
    constructor() {
        this.a = 2;
        this.t = 'mesh';
    }
}
function TestFn(){
  return {
   a:2,
   t:'mesh'
  };
}
</script>

Tests:

new class
var obj = new TestClass();
new fn
var obj = TestFn();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new class
new fn

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
new class	8299375.0 Ops/sec
new fn	6840172.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript benchmark that measures the performance of two approaches: creating an instance of a class versus returning an object from a function. The test is designed to compare the performance of these two approaches, specifically in terms of the `instanceOf` operator compared to comparing a basic string type.

**Options Compared**

There are two options being compared:

1. **New Class**: Creating an instance of a custom class (`TestClass`) using the `new` keyword.
2. **Function Returning Object**: Returning an object directly from a function (`TestFn`).

**Pros and Cons of Each Approach**

* **New Class**
	+ Pros:
		- Can encapsulate data and behavior in a single unit (class).
		- Can provide a way to organize code using inheritance.
	+ Cons:
		- Creates an instance of the class, which can have overhead due to memory allocation and garbage collection.
		- May require more verbose syntax when accessing properties or calling methods.
* **Function Returning Object**
	+ Pros:
		- Lightweight and easy to create.
		- Does not require creating a new object (i.e., no memory allocation).
		- Can be used as a higher-order function, where the returned object is passed as an argument.
	+ Cons:
		- Returns an object without encapsulating data and behavior in a single unit.
		- May lead to issues with code organization and maintainability.

**Library and Purpose**

The `TestClass` class and `TestFn` function are custom implementations used for this benchmark. The purpose of these examples is to illustrate the performance differences between creating an instance of a class versus returning an object from a function.

**Special JS Feature or Syntax (None)**

There are no special JavaScript features or syntax being tested in this benchmark.

**Other Alternatives**

Other approaches that could be used for this benchmark include:

* Using constructors with `Object.create()` or `Function.prototype.constructor`
* Creating objects using libraries like Lodash or Ramda
* Implementing a factory function to create instances of classes

However, the provided options (new class vs function returning object) are straightforward and easily understandable, making it easier for developers to compare their performance without introducing unnecessary complexity.

Keep in mind that this benchmark is focused on measuring the performance difference between creating an instance of a class versus returning an object from a function. The choice of approach may depend on the specific requirements and constraints of your project.

Related benchmarks:

new class vs function returning obj (version: 0)

Measure the performance of instanceOf operator vs comparing a basic string type.

Comparing performance of: new class vs new fn

Created: one year ago by: Guest

Jump to the latest result

new class

new fn

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):