Benchmark: Class instance method lookup vs function-created object method lookup (fork)

Script Preparation code:

window.AClass = class {
  constructor() {
    this.c = () => 5;
  }
  
  b() {
    return 4;
  }
}

window.AFunc = function() {
  function c() {
    return 5;
  }
  
  return {
    b() {
      return 4;
    },
    c,
  };
};

Tests:

Class instance method lookup
const a = new AClass(); a.b(); a.c();
Function-created object method lookup
const a = new AFunc(); a.b(); a.c();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Class instance method lookup
Function-created object method lookup

Fastest: N/A

Slowest: N/A

Latest run results:

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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's being tested.

**Benchmark Overview**

The benchmark compares two approaches to invoke methods on objects:

1. **Class instance method lookup**: This approach uses an instance of a class (`AClass`) to access its methods.
2. **Function-created object method lookup**: This approach uses a function that returns an object with methods (`AFunc`) to access its methods.

**Options Compared**

The benchmark compares the performance of these two approaches on:

* A simple class `AClass` with two methods: `b()` and `c()`.
* A function `AFunc` that returns an object with two methods: `b()` and `c()`.

**Pros and Cons**

### Class Instance Method Lookup

Pros:

* Easier to understand and maintain, as the code is more straightforward.
* Typically faster, since the instance can be cached by the JavaScript engine.

Cons:

* May lead to slower performance in some cases, since the class instance needs to be created and looked up.
* Can be more memory-intensive, depending on the size of the class.

### Function-Created Object Method Lookup

Pros:

* Can be faster in some cases, since the function can be cached by the JavaScript engine and the object creation is optimized.
* Often used in libraries and frameworks, making it a common pattern to test.

Cons:

* Can be more complex and harder to understand, as the code requires careful consideration of the function's behavior.
* May lead to slower performance if the function needs to be re-created or looked up every time.

**Other Considerations**

The benchmark also considers the following factors:

* The type of device (Desktop) and operating system (Linux).
* The browser version (Chrome 92).

These factors can affect the performance of the benchmark, as different devices and browsers may have varying levels of optimization or caching.

**Library Usage**

In this case, the library used is not explicitly stated. However, it's likely that the `class` keyword and object literals are part of the ECMAScript standard, which provides a way to define classes and objects in JavaScript.

**Special JS Features/Syntax**

This benchmark does not use any special JavaScript features or syntax beyond what's commonly supported by modern browsers.

**Alternatives**

If you want to create your own microbenchmarks using MeasureThat.net, here are some alternative approaches you could consider:

* Comparing the performance of different caching strategies (e.g., memoization vs. caching in a `Map`).
* Testing the performance of different data structures (e.g., arrays vs. linked lists).
* Measuring the impact of different optimization techniques (e.g., loop unrolling vs. parallel processing).

Keep in mind that the specific approach and testing scenario you choose will depend on your goals, expertise, and resources.

Related benchmarks:

Class instance method lookup vs function-created object method lookup (fork) (version: 0)

Comparing performance of: Class instance method lookup vs Function-created object method lookup

Created: 5 years ago by: Guest

Jump to the latest result

Class instance method lookup

Function-created object method lookup

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):