Benchmark: Proxy set performance

Script Preparation code:

var obj = {};

var _obj = {};
var proxy = new Proxy(_obj, {
  set: (obj, prop, value) => { _obj[prop] = value; }
});

var defineProp = {};
Object.defineProperty(defineProp, 'prop', {
  configurable: false,
  set: v => defineProp._v = v
});

Tests:

Direct
obj.prop = 5;
Define Property
defineProp.prop = 5;
Proxy
proxy.prop = 5;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Direct
Define Property
Proxy

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Windows

View result in a separate tab

Test name	Executions per second
Direct	13820520.0 Ops/sec
Define Property	6755311.5 Ops/sec
Proxy	1519308.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript benchmark that tests the performance of three different approaches to set a property on an object: direct assignment, using `Object.defineProperty()`, and using a Proxy.

**Benchmark Definition**

The benchmark definition consists of two parts:

1. **Script Preparation Code**: This code sets up the environment for the benchmark by creating two objects, `_obj` and `defineProp`. It then creates a new Proxy instance, `proxy`, with a `set` trap that updates the corresponding property on `_obj`.
2. **Html Preparation Code**: This field is empty in this case, indicating that no HTML-specific code needs to be executed before running the benchmark.

**Individual Test Cases**

There are three test cases:

1. **Direct**: Sets a property directly on the `obj` object using `obj.prop = 5;`.
2. **Define Property**: Uses `Object.defineProperty()` to define a property on the `defineProp` object, setting `prop` to an initial value of `undefined`. Then, sets the same property using `defineProp.prop = 5;`.
3. **Proxy**: Sets a property directly on the `proxy` Proxy instance using `proxy.prop = 5;`.

**Comparison and Analysis**

The benchmark compares the performance of these three approaches:

*   Direct assignment: This is the simplest approach, where you set the property directly on the object without any intermediate steps.
*   Using `Object.defineProperty()`: This method provides more control over property settings, including allowing you to specify the initial value and the getter and setter functions. However, it may introduce overhead due to the additional steps involved.
*   Using a Proxy: Proxies provide a way to create dynamic properties on an object without directly accessing its underlying properties. This approach can be useful in certain scenarios but may add complexity.

**Pros and Cons**

*   Direct assignment:
    *   Pros: Simple, fast, and easy to understand.
    *   Cons: Does not allow for fine-grained control over property settings.
*   Using `Object.defineProperty()`:
    *   Pros: Provides more control over property settings, allows for initial value specification, and supports getter and setter functions.
    *   Cons: May introduce overhead due to the additional steps involved.
*   Using a Proxy:
    *   Pros: Allows for dynamic properties without direct access to underlying objects, can be useful in certain scenarios.
    *   Cons: Adds complexity due to the proxy creation process.

**Library Usage**

None of the test cases explicitly use any libraries beyond the built-in `Object` and `Proxy` functions.

**Special JS Features or Syntax**

The benchmark uses the following special JavaScript features:

*   Proxies (`new Proxy()`)
*   `Object.defineProperty()`
*   Getter and setter functions

These features are not specific to modern JavaScript versions but have been part of the language since its inception. However, the usage of Proxies is relatively new and became widely available in ECMAScript 2015 (ES6).

**Other Alternatives**

If you're looking for alternative approaches or libraries that might improve performance in similar scenarios, consider:

*   Using a library like `lodash` to simplify property setting operations.
*   Employing a different data structure, such as an object with a custom getter and setter function, to avoid the overhead of using `Object.defineProperty()`.
*   Utilizing a caching mechanism or memoization techniques to optimize performance.

Keep in mind that these alternatives may not always be more efficient than the approaches tested in this benchmark, and their effectiveness depends on specific use cases and requirements.

Related benchmarks:

Proxy set performance (version: 0)

Comparing performance of: Direct vs Define Property vs Proxy

Created: one year ago by: Guest

Jump to the latest result

Direct

Define Property

Proxy

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):