Benchmark: Proxy vs defineProperty v2

Script Preparation code:

object = { value: 'data', getData() {return this.value;}, get data() { return this.value } };
Object.defineProperty(object, 'dataProperty', {
  get() { return this.value; }
});
proxy = new Proxy(object, {})
proxyWithReflectHandler = new Proxy(object, {
	get(target, prop, receiver) {
    	return Reflect.get(target, prop, receiver)
    }
})
proxyWithHandler = new Proxy(object, {
	get(target, prop, receiver) {
    	return object[prop];
    }
})

Tests:

Object access
object.value;
Proxy access
proxy.value
Proxy with get handler access
proxyWithHandler.value
Use of simple getter
object.getData();
Use of defineProperty
object.dataProperty;
Proxy with get reflect handler access
proxyWithReflectHandler.value
object get data
object.data;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object access
Proxy access
Proxy with get handler access
Use of simple getter
Use of defineProperty
Proxy with get reflect handler access
object get data

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 26 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Linux

View result in a separate tab

Test name	Executions per second
Object access	75577720.0 Ops/sec
Proxy access	46859860.0 Ops/sec
Proxy with get handler access	19058822.0 Ops/sec
Use of simple getter	56411948.0 Ops/sec
Use of defineProperty	45007824.0 Ops/sec
Proxy with get reflect handler access	18887074.0 Ops/sec
object get data	45341704.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):

LLMs can make mistakes. Check important info.

The benchmark you provided is designed to compare various methods of accessing properties on a JavaScript object, specifically focusing on the performance of direct property access versus using JavaScript's Proxy and `Object.defineProperty`. Below are detailed descriptions of each test case, as well as the performance implications of these different approaches.

### Options Compared

1. **Direct Property Access (`object.value`)** 
   - **Description**: Accessing the property directly from the object.
   - **Performance**: This is generally the fastest method of property access because it involves minimal overhead.
   - **Pros**: Fastest execution, simple syntax.
   - **Cons**: Limited in extensibility or the ability to attach behavior to property accesses.

2. **Proxy Access (`proxy.value`)**
   - **Description**: Accessing properties using a `Proxy` object, which allows you to define custom behaviors for fundamental operations (such as property access).
   - **Performance**: Slightly slower than direct access but may offer significant flexibility.
   - **Pros**: Allows intercepting and redefining fundamental operations, which can support features like logging or validation.
   - **Cons**: Introduces performance overhead compared to direct access.

3. **Proxy with Custom Getter (`proxyWithHandler.value`)**
   - **Description**: Accessing via a proxy that uses a custom `get` handler that points directly to the original object.
   - **Performance**: Similar to direct proxy access, but may be marginally slower due to the handler definition.
   - **Pros**: Can add controlled access behaviors.
   - **Cons**: Adds some complexity and potential performance overhead.

4. **Use of Simple Getter (`object.getData()`)**
   - **Description**: Accessing a method defined on the object that returns the value.
   - **Performance**: Slower than direct access because it involves a function call.
   - **Pros**: Encapsulates logic for retrieving the data.
   - **Cons**: The function call incurs overhead, making it less efficient for simple access.

5. **Use of `defineProperty` (`object.dataProperty`)**
   - **Description**: Property access through a property defined with `Object.defineProperty`.
   - **Performance**: Typically slower than direct access and can be more complex.
   - **Pros**: You can define custom getters and setters, enabling controlled property access.
   - **Cons**: Slower due to additional overhead and complexity in defining properties.

6. **Object Getter Access (`object.data`)**
   - **Description**: Accessing a computed property via an object getter.
   - **Performance**: Generally doesn't perform as well as direct access but is often used for its flexibility.
   - **Pros**: Similar advantages as `defineProperty` while also enabling encapsulation.
   - **Cons**: Still slower than direct property access due to getter invocation.

7. **Proxy with `Reflect` Handler (`proxyWithReflectHandler.value`)**
   - **Description**: Proxy using the `Reflect` object to get property values, which allows for safer and more predictable property access.
   - **Performance**: Usually slower than basic proxy access due to the overhead of using the `Reflect` API.
   - **Pros**: Provides a way to maintain the behavior of standard operations.
   - **Cons**: Increased performance cost compared to other methods.

### Summary of Performance Results
From the benchmark results:

- **Direct access** displayed the highest performance at approximately 118 million executions per second.
- The **simple getter method** was next, reflecting a balance of performance with added encapsulation (~88 million executions).
- **Proxy without handlers** followed, measuring around 81 million executions.
- **Define Property access** resulted in performance still less than a simple getter (~74 million).
- Use of **object getters** yielded slightly fewer executions (~72 million).
- **Proxy with custom handler** and **Proxy with Reflect handler** had the lowest performance, reflecting the overhead introduced by their respective definitions (~46 million and ~45 million respectively).

### Alternatives
Alternatives to using a direct object access might include:

- **Using libraries** such as Immutable.js for immutable data structures, though this typically comes with inherent performance trade-offs due to structural sharing.
- **State management libraries** (like Redux) which employ an immutable data approach but also add overhead.
- Using built-in functions (like `map`, `filter`, etc.) on arrays or objects/copies which can offer additional functionality at the cost of performance.

In conclusion, while the use of proxies and property definition methods can provide useful patterns for handling data, they typically come with performance costs that should be considered in high-performance applications. For most day-to-day operations where performance is paramount, direct property access remains the fastest and simplest approach.

Related benchmarks:

Proxy vs defineProperty v2 (version: 1)

Comparing performance of: Object access vs Proxy access vs Proxy with get handler access vs Use of simple getter vs Use of defineProperty vs Proxy with get reflect handler access vs object get data

Created: 2 months ago by: Guest

Jump to the latest result

Object access

Proxy access

Proxy with get handler access

Use of simple getter

Use of defineProperty

Proxy with get reflect handler access

object get data

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 2 months ago):