Benchmark: Access to Proxy vs Array

Script Preparation code:

object = ['data'];
proxy = new Proxy(object, {})
proxyWithHandler = new Proxy(object, {
	get(target, prop, receiver) {
    	return Reflect.get(target, prop, receiver)
    }
})
proxyWithHandler2 = new Proxy(object, {
	get(target, prop, receiver) {
    	return target[prop]
    }
})

Tests:

Array access
object[0];
Proxy access
proxy[0]
Proxy with reflect handler
proxyWithHandler[0]
Proxy with handler
proxyWithHandler2[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array access
Proxy access
Proxy with reflect handler
Proxy with handler

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 29 days ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Chrome OS 14541.0.0

View result in a separate tab

Test name	Executions per second
Array access	59278932.0 Ops/sec
Proxy access	6528805.0 Ops/sec
Proxy with reflect handler	2841743.0 Ops/sec
Proxy with handler	4109225.8 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):

LLMs can make mistakes. Check important info.

The benchmark you provided compares the performance of accessing data in a basic JavaScript array versus accessing data through different types of JavaScript proxies. Below is a detailed analysis of what is tested, the approaches compared, their pros and cons, and other considerations.

### **Benchmark Structure and Test Cases**

1. **Array Access**
   - **Test Case:** `object[0];`
   - **Test Name:** **Array access**
   - **Description:** This test accesses the first element of a standard array directly.

2. **Proxy Access**
   - **Test Case:** `proxy[0];`
   - **Test Name:** **Proxy access**
   - **Description:** This test accesses the first element of an array wrapped in a proxy without any custom handler logic.

3. **Proxy with Reflect Handler**
   - **Test Case:** `proxyWithHandler[0];`
   - **Test Name:** **Proxy with Reflect handler**
   - **Description:** This test accesses the first element of the array through a proxy using a handler that utilizes the `Reflect` API to delegate to the target object's original property access.

4. **Proxy with Custom Handler**
   - **Test Case:** `proxyWithHandler2[0];`
   - **Test Name:** **Proxy with handler**
   - **Description:** This test accesses the first element of the array through a proxy with a basic custom handler that directly accesses the target.

### **Performance Results**

The results indicate the number of executions per second for each test case:

- **Array access:** 142,150,224.0 executes/second
- **Proxy access:** 21,883,988.0 executes/second
- **Proxy with handler:** 14,762,487.0 executes/second
- **Proxy with Reflect handler:** 11,343,484.0 executes/second

### **Comparative Analysis**

#### **Array Access (Direct Access)**
- **Pros:**
  - Fastest method, as it directly accesses the property.
  - Minimal overhead; offers the best performance for simple usage.
- **Cons:**
  - Lacks flexibility. Not suitable for scenarios requiring interception of property access.

#### **Proxy Access (No Handler)**
- **Pros:**
  - Allows for flexibility in managing property accesses for cases that might require later customizations.
- **Cons:**
  - Introduces a performance overhead due to proxy interception, and this method is slower than direct array access.

#### **Proxy with Reflect Handler**
- **Pros:**
  - Offers a standardized way to handle property access through the `Reflect` API, allowing you to maintain proper access behavior while providing more features.
  - Future-proofing code; you could later add more sophisticated behaviors like logging or validation without changing the core access pattern.
- **Cons:**
  - Increased performance overhead compared to direct access due to the handler and utility `Reflect` methods; making it the slowest option in this benchmark.

#### **Proxy with Custom Handler**
- **Pros:**
  - Provides a simple way to customize access. Allows flexibility for potential future additions, like validation or logging.
- **Cons:**
  - Similar overhead issues as the Reflect handler due to interception. Less standard than using Reflect, leading to potential inconsistencies in behavior if more complex behavior is needed later.

### **Other Considerations**

- **Memory Consumption:** Proxies can consume more memory due to internal handlers, which could be a factor in environments where memory usage is a concern.
- **Use Cases:** While using a direct array is optimal for performance, proxies are best suited for cases where you need to monitor or control property accesses, such as in frameworks or libraries for state management, validation, or observability.
  
### **Alternatives**

1. **Direct Object Access**: Similar to array access; directly access the properties of a standard object without proxies. This is the fastest method when you don't need dynamic behavior.
  
2. **Functional Programming Approaches**: For managing state or data access, consider using functional paradigms, such as pure functions and immutability, which can mitigate some of the issues with side effects in stateful operations.

3. **Using Observables or Data Proxies**: Libraries like MobX or Vue.js' reactivity system provide mechanisms to track and reactively update data, often using proxies under the hood, which can provide enhanced capabilities (e.g., automatically triggering UI updates) but come with similar performance considerations.

In summary, the benchmark provides valuable insights into the trade-offs between performance and flexibility in accessing data using JavaScript arrays and proxies. Understanding these dynamics can help developers choose the right approach based on their application’s needs.

Related benchmarks:

Access to Proxy vs Array (version: 1)

Comparing performance of: Array access vs Proxy access vs Proxy with reflect handler vs Proxy with handler

Created: one month ago by: Guest

Jump to the latest result

Array access

Proxy access

Proxy with reflect handler

Proxy with handler

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):