Benchmark: Processing Arrays

Script Preparation code:

class Class {
    constructor(i) {
        this._val = i
    }
    get value() {
        return this._val
    }
    getValue() {
        return this._val
    }
}
var count = 1000000;
var arr = [];
var clss = [];
for (let i = 0; i < count; i++) {
    clss.push(new Class(i));
    arr.push(i);
}
var result;

Tests:

Getter
for (let i = 0; i < count; i++) result = clss[i].value;
Function
for (let i = 0; i < count; i++) result = clss[i].getValue();
Direct
for (let i = 0; i < count; i++) result = clss[i]._val;
Array
for (let i = 0; i < count; i++) result = arr[i];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Getter
Function
Direct
Array

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down what is being tested in this benchmark and the different approaches compared.

**Benchmark Definition**

The benchmark definition is a script that creates an array of 1,000,000 elements and then iterates over it to retrieve values using four different methods:

1. **Getter**: `clss[i].value`
2. **Function**: `clss[i].getValue()`
3. **Direct**: `clss[i]._val`
4. **Array**: `arr[i]`

**Approaches Compared**

Each approach has its pros and cons:

* **Getter**: This is the most JavaScript-like way of accessing properties. It's also the most efficient, as it allows for method overriding and dynamic property access. However, it may incur some overhead due to the explicit method call.
* **Function**: This approach uses a separate function (`getValue`) to retrieve the value. While this might seem like an additional layer of complexity, it can be beneficial in certain scenarios (e.g., caching or reusability). However, it's less efficient than the getter approach and may lead to unnecessary function calls.
* **Direct**: This approach accesses the private field `_val` directly. While this is a concise way to access the value, it bypasses JavaScript's property resolution mechanism, which can lead to unexpected behavior if not used carefully. Additionally, using private fields in this way is non-standard and might not be supported by all browsers.
* **Array**: This approach accesses the array element directly, without any additional method calls. While this is straightforward, it doesn't leverage the features of JavaScript objects (e.g., getter methods) and may lead to slower performance.

**Library Usage**

The benchmark uses a simple class (`Class`) with a private field `_val`. The `getValue` method is used to retrieve the value of the private field. This is a common pattern in JavaScript, where a class might use a private field (or a similar concept like a private variable) and expose it through a getter method.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark that aren't widely supported by modern browsers.

**Alternative Approaches**

Some alternative approaches to consider:

* **Using `Object.values()`**: Instead of accessing the array element directly, you could use `Object.values(arr)` to retrieve an array of values. This approach is more concise and leverages the features of JavaScript objects.
* **Using a library like Lodash**: If performance is critical, you might consider using a library like Lodash, which provides optimized implementations for various iterative operations (e.g., `_.map()`, `_.filter()`).

In summary, this benchmark compares four approaches to retrieve values from an array: the most JavaScript-like way (`Getter`), a separate function approach (`Function`), direct access (`Direct`), and simple array access (`Array`). The choice of approach depends on the specific use case, performance requirements, and desired level of conciseness.

Related benchmarks:

Processing Arrays (version: 0)

Comparing performance of: Getter vs Function vs Direct vs Array

Created: 4 years ago by: Registered User

Jump to the latest result

Getter

Function

Direct

Array

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):