object = { value: 'data', getData() {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]; }})let x = object.value;let x = proxy.valuelet x = proxyWithHandler.valuelet x = object.getData();let x = object.dataProperty;let x = proxyWithReflectHandler.value--enable-precise-memory-info flag.
| 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 |
| Test name | Executions per second |
|---|---|
| Object access | 110222384.0 Ops/sec |
| Proxy access | 33548720.0 Ops/sec |
| Proxy with get handler access | 23838062.0 Ops/sec |
| Use of simple getter | 95985096.0 Ops/sec |
| Use of defineProperty | 94309056.0 Ops/sec |
| Proxy with get reflect handler access | 17240820.0 Ops/sec |
Let's break down the provided benchmark and its test cases.
Benchmark Overview
The benchmark measures the performance of different approaches to create a proxy object in JavaScript, specifically:
Proxy constructor with an empty handlerProxy constructor with a custom get handler (using Reflect.get)Proxy constructor with a custom get handler that returns the value directly (proxyWithHandler)The benchmark also includes test cases for accessing the proxy object's properties, using either direct property access or getter methods.
Library and Special JavaScript Features
In this benchmark, the following libraries are used:
Benchmark Test Cases
The test cases can be grouped into three categories:
A) Direct Property Access: This category includes test cases where the proxy object is accessed directly, using the proxy.value syntax.
* Pros: Simple and straightforward approach
* Cons: May involve unnecessary computations or checks (e.g., to determine if the property exists)
B) Proxy with Custom Get Handler: This category includes test cases where a custom get handler is used to access the proxy object's properties.
* Pros: Allows for fine-grained control over property access, reducing unnecessary computations
* Cons: Requires defining and implementing a custom getter function, which may introduce additional overhead
C) Proxy with Simple Getter: This category includes test cases where a simple getter method is used to access the proxy object's properties.
* Pros: Similar to the custom get handler approach, but uses a built-in feature (getter methods)
* Cons: May still involve unnecessary computations or checks
Benchmark Results
The benchmark results show the performance of each approach on a specific device running Firefox Mobile 122. The top-performing approaches are:
Proxy constructor with an empty handlerProxy constructor with a custom get handler (using Reflect.get)Proxy constructor with a custom get handler that returns the value directly (proxyWithHandler)Alternatives
Other alternatives to creating proxies in JavaScript include:
In summary, the benchmark measures the performance of different approaches to create a proxy object in JavaScript, including direct property access, custom get handlers, and simple getters. The results show that using Proxy constructors with custom get handlers can be faster than other approaches, but the best approach depends on specific use cases and requirements.
