Benchmark: javascript class vs function closure

Tests:

class
class CowClass { constructor(lungCapacity) { this.lungCapacity = lungCapacity this.airInLungs = 0 } getAirInLungs() { return this.airInLungs } breathe () { this.airInLungs = this.lungCapacity } moo () { let output = 'm' let air = this.getAirInLungs() while (air --> 0) { // The 'goes to' operator output += 'o' } this.airInLungs = air return output } } const cow = new CowClass(3000) cow.breathe() cow.moo()
closure
function CowClosure(lungCapacity) { let airInLungs = 0 function breathe () { airInLungs = lungCapacity } function getAirInLungs () { return airInLungs } function moo () { let output = 'm' let air = getAirInLungs() while (air --> 0) { // The 'goes to' operator.df output += 'o' } airInLungs = air return output } return {breathe:breathe, moo:moo} } const cow = CowClosure(3000) cow.breathe() cow.moo()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
class
closure

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 13 hours ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 131 on Android

View result in a separate tab

Test name	Executions per second
class	18830.3 Ops/sec
closure	35475.8 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The provided benchmark compares the performance of two approaches: creating a JavaScript class versus using a function closure to encapsulate related functions.

**Options Compared**

There are two options being compared:

1. **Class**: A JavaScript class definition, which creates an instance of the class with its own scope and properties.
2. **Closure**: A function closure that returns an object with three functions: `breathe`, `getAirInLungs`, and `moo`. This approach also encapsulates related functions but uses a different syntax.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Class**:
	+ Pros:
		- More intuitive for developers familiar with object-oriented programming.
		- Can be more readable, especially when dealing with complex logic or multiple inheritance.
	+ Cons:
		- May introduce overhead due to the creation of a new scope.
		- Can lead to tighter coupling between functions, making it harder to maintain and modify code.
* **Closure**:
	+ Pros:
		- Can be more lightweight and efficient since it doesn't create a new scope.
		- Allows for greater flexibility in terms of reusability and modularity.
	+ Cons:
		- May require more developer expertise, especially when dealing with complex closures.
		- Can lead to less readable code if not properly structured.

**Library Usage**

In this benchmark, there is no explicit library usage mentioned. However, it's worth noting that the `->` operator used in the closure code (e.g., `air --> 0`) is a non-standard JavaScript feature introduced in ECMAScript 2020. This operator allows for pre-decrement and post-increment operations.

**Special JS Features or Syntax**

As mentioned earlier, the `->` operator is a new syntax feature introduced in ECMAScript 2020. If your JavaScript engine doesn't support this feature, you might need to rewrite the closure code using traditional operators (e.g., `air-- && air--`.

**Other Alternatives**

If you're interested in exploring alternative approaches or optimizing your JavaScript performance, here are some additional options:

1. **Prototypal Inheritance**: Instead of using a class, consider using prototypal inheritance to create objects with shared properties and methods.
2. **Modules**: If you're working with modern JavaScript frameworks or libraries (e.g., ES6 modules), consider using them for better code organization and reusability.
3. **Just-In-Time (JIT) Compilation**: Some JavaScript engines, like SpiderMonkey in Firefox, offer JIT compilation to optimize performance-critical code.

Keep in mind that each approach has its own strengths and weaknesses, and the choice ultimately depends on your specific use case and performance requirements.

Related benchmarks:

javascript class vs function closure (version: 0)

Comparing performance of: class vs closure

Created: one year ago by: Registered User

Jump to the latest result

class

closure

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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