Benchmark: prototype vs class

Tests:

prototype
const obj = { a: 1, b: 2, itemQty: 10, stockStatus: 'IN_STOCK' } function itemFilter(transformer) { delete transformer.item.itemQty; delete transformer.item.stockStatus return transformer.transform(); } /* function featureRoleFilter(item) { delete item.stockStatus return item } */ function TransformItem(item) { this.item = item; this.transform = () => this.item; } const i = new TransformItem(obj) console.log(i) itemFilter(i) console.log(i.item)
class based
const obj = { a: 1, b: 2, itemQty: 10, stockStatus: 'IN_STOCK' } class Item { constructor() { this.item = obj; } transform() { return this.item; } } class FeatureRoleFilter extends Item { constructor(t) { super(); this.t = t; } transform() { delete this.item.itemQty; delete this.item.stockStatus; return this.t.transform(); } } let transformer = new Item(); console.log(transformer.transform()) transformer = new FeatureRoleFilter(transformer) console.log(transformer.transform())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
prototype
class based

Fastest: N/A

Slowest: N/A

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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 explain what is being tested.

**Benchmark Definition**

The benchmark definition provides two different approaches to implement an `itemFilter` function:

1. **Prototype-based approach**: This approach uses the prototype chain to modify the object's properties.
2. **Class-based approach**: This approach defines a class with methods that modify the object's properties.

**Options being compared**

In this benchmark, the following options are being compared:

* Prototype-based approach
* Class-based approach

**Pros and Cons of each approach**

1. **Prototype-based approach**
	* Pros:
		+ Lightweight: No need to create a new class instance.
		+ Fast: Direct access to properties without creating a new object.
	* Cons:
		+ Less readable: Not intuitive for developers who are not familiar with prototype chains.
		+ Less maintainable: Modifying properties directly on the prototype can lead to unintended consequences.
2. **Class-based approach**
	* Pros:
		+ Readable: Easier to understand and maintain, especially for developers who are familiar with object-oriented programming.
		+ Maintainable: Encapsulation of data and behavior makes it easier to modify or extend the code without affecting other parts of the program.
	* Cons:
		+ Heavyweight: Creates a new class instance, which can be slower than modifying a prototype chain.

**Library/Features used**

In this benchmark, no specific JavaScript library is being used. However, some features are used:

* **Arrow functions**: Used in `itemFilter` and `TransformItem`.
* **Class syntax**: Used to define the `FeatureRoleFilter` class.
* **Constructor methods**: Used to initialize objects.

**Special JS feature/Syntax**

No special JavaScript features or syntax are being explicitly tested in this benchmark. However, some general JavaScript concepts like prototype chains and classes are being demonstrated.

**Other alternatives**

If you want to test alternative approaches, here are a few examples:

* **Functional programming approach**: Using `map()` or `filter()` to achieve the same result without creating a new class instance.
* **Object literal-based approach**: Creating an object with methods that modify its properties instead of using classes.

Keep in mind that each alternative may have its own pros and cons, and some might be more suitable for specific use cases than others.

Related benchmarks:

prototype vs class (version: 0)

Comparing performance of: prototype vs class based

Created: 3 years ago by: Guest

Jump to the latest result

prototype

class based

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):