Benchmark Overview

The MeasureThat.net benchmark measures the performance of JavaScript microbenchmarks, specifically comparing the execution times of three different approaches: direct object access, proxy access, and proxy access with a getter handler.

Benchmark Definition JSON Analysis

The benchmark definition JSON contains information about the script preparation code, which is used to create objects, proxies, and a custom getter handler. Here's a breakdown of the relevant parts:

• Script Preparation Code: This section creates an object object with a property value, sets up two proxy objects (proxy and proxyWithHandler) using the Proxy constructor, and defines a custom getter handler for proxyWithHandler. The script is executed to create these proxies.
• Html Preparation Code: This section is empty, indicating that no HTML preparation code is required.

Options Compared

The benchmark compares three options:

1. Direct Object Access: Directly accessing the value property of the object using dot notation (object.value).
2. Proxy Access: Accessing the value property of the proxy object.
3. Proxy with Get Handler Access: Accessing the value property of the proxyWithHandler object, which uses a custom getter handler to delegate access to the underlying object.

Pros and Cons

Here's a brief summary of the pros and cons of each approach:

• Direct Object Access:
  • Pros: Simple, efficient, and predictable.
  • Cons: May incur additional overhead due to type checking and other mechanisms.
• Proxy Access:
  • Pros: Can provide additional functionality (e.g., caching) and flexibility.
  • Cons: May introduce additional overhead due to proxy creation and lookup.
• Proxy with Get Handler Access:
  • Pros: Provides a way to customize access to the underlying object while maintaining encapsulation.
  • Cons: Requires careful design of the getter handler, which can add complexity.

Library and Custom Getter Handler

The Reflect.get() function is used in the custom getter handler to delegate access to the underlying object. This function allows for more fine-grained control over property access, making it easier to implement custom logic without modifying the underlying object.

Special JS Feature or Syntax

There are no special JavaScript features or syntax mentioned in this benchmark definition. It uses standard JavaScript constructs and does not rely on any experimental or proposed features.

Alternatives

If you're interested in exploring alternative approaches for proxying objects, consider:

• Using a library like ProxyHandler (ECMAScript 2015) to create a custom getter handler.
• Implementing your own proxy object using a wrapper class or function.
• Utilizing other JavaScript features, such as decorators (for a more modern approach), that provide similar functionality.

Keep in mind that each alternative may introduce additional complexity and trade-offs.