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()

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Firefox 7 runs

closure

85K/s

class

73K/s

Fastest: closure (1.2x faster)

View exact numbers

✓ closure: 84,963 ops/sec
• class: 73,301 ops/sec

Chrome 6 runs

closure

89K/s

class

70K/s

Fastest: closure (1.3x faster)

View exact numbers

✓ closure: 88,592 ops/sec
• class: 70,067 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

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: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36

Browser/OS: Chrome 150 on Mac OS X 10.15.7

View result in a separate tab

closure

66K/s

class

51K/s

View exact numbers

Test name	Executions per second
✓ closure	65,600 Ops/sec
class	51,414 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 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.

javascript class vs function closure (version: 0) Benchmark.js

Comparing performance of: `class vs closure`

Created: 3 years ago by: Registered User

Go to the latest result

class

closure

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Firefox 7 runs

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

javascript class vs function closure (version: 0) Benchmark.js

Comparing performance of: class vs closure

Created: 3 years ago by: Registered User

Go to the latest result

class

closure

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Firefox 7 runs

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `class vs closure`