Benchmark: new versus raw object creation

Script Preparation code:

let entityId = 0;

function Entity () {
	this.id = entityId++;
	this.x = 0;
	this.y = 0;
  	this.angle = 0;
}

function createEntity () {

	const obj = {
		id : entityId++,
		x : 0,
		y : 0,
		angle : 0,
    }

	return obj;
}

Tests:

new
const obj = new Entity (); obj.angle = obj.x + obj.y;
{}
const obj = createEntity (); obj.angle = obj.x + obj.y;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new
{}

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark and its testing.

**Benchmark Description**
The benchmark compares two approaches to create objects in JavaScript: using the `new` keyword and creating an object from scratch without the `new` keyword (also known as "raw object creation").

**Options Compared**

1. **New Keyword**: Using the `new` keyword to create a new instance of an object.
2. **Raw Object Creation**: Creating an object directly from scratch using the `{}` syntax.

**Pros and Cons of Each Approach**

*   **New Keyword**
    *   Pros:
        *   Easier to read and understand, especially for complex objects with multiple constructors or inheritance.
        *   Automatic property initialization and prototype chain management.
        *   Can be more efficient due to optimizations in the JavaScript engine.
    *   Cons:
        *   May introduce overhead due to the creation of a new object and potential garbage collection.
*   **Raw Object Creation**
    *   Pros:
        *   Can be faster since it doesn't involve creating a new object or prototype chain.
        *   Provides more control over the initial state of objects.
    *   Cons:
        *   Less readable and maintainable, especially for complex objects or those with multiple constructors.
        *   Requires manual property initialization.

**Library Usage**
In this benchmark, no external libraries are used. The `Entity` function is a custom class that represents an entity in the game. It has properties like `id`, `x`, `y`, and `angle`. The `createEntity()` function creates new objects using either the `new` keyword or raw object creation.

**Special JavaScript Features**
This benchmark uses JavaScript features such as:

*   Classes (defined using the `function Entity () { ... }` syntax)
*   Constructor functions (`Entity`)
*   Property initialization (`this.id = entityId++`, `obj.x = 0`, etc.)
*   Prototype chain management

These features are part of modern JavaScript and are used to create and manage objects in a concise and expressive way.

**Alternatives**
Other alternatives for creating objects in JavaScript include:

1.  **Class expressions**: Using the `class` keyword with function declarations, like `class Entity { ... }`.
2.  **Constructor functions without the `new` keyword**: Creating object constructors without using the `new` keyword, like `function Entity() { ... }`.
3.  **ES6 modules and classes**: Using ES6 modules and class syntax to create objects.

Each of these alternatives has its own strengths and weaknesses, depending on the specific use case and requirements.

Related benchmarks:

new versus raw object creation (version: 0)

Comparing performance of: new vs {}

Created: 4 years ago by: Guest

Jump to the latest result

new

{}

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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