Benchmark: Object.getOwnPropertyDescriptor().value vs Reflect.get()

Tests:

Object.getOwnPropertyDescriptor()
let object1 = { property1: 42 }; Object.getOwnPropertyDescriptor(object1, 'property1').value;
Reflect.get()
let object1 = { property1: 42 }; Reflect.get(object1, 'property1');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.getOwnPropertyDescriptor()
Reflect.get()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Object.getOwnPropertyDescriptor()	33085664.0 Ops/sec
Reflect.get()	427043264.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing the performance of different approaches to achieve similar goals.

**Benchmark Definition JSON Analysis**

The provided Benchmark Definition JSON defines two benchmark test cases:

1. **Object.getOwnPropertyDescriptor().value vs Reflect.get()**
This benchmark tests the performance of using `Object.getOwnPropertyDescriptor()` to access property values versus using `Reflect.get()` for the same purpose.
2. **Individual test cases:**
	* "Object.getOwnPropertyDescriptor()"
		+ This benchmark defines a single test case that measures the execution time of calling `Object.getOwnPropertyDescriptor()` on an object.
	* "Reflect.get()"
		+ This benchmark defines another test case that measures the execution time of calling `Reflect.get()` on an object.

**Options Compared**

The two main options being compared are:

1. **`Object.getOwnPropertyDescriptor().value`**: This approach uses the built-in method `Object.getOwnPropertyDescriptor()` to retrieve the property value, and then accesses it directly using `.value`.
2. **`Reflect.get(object, 'property')`**: This approach uses the JavaScript Reflect API's `get()` method to retrieve the property value in a single step.

**Pros and Cons of Each Approach**

1. **`Object.getOwnPropertyDescriptor().value`**
	* Pros:
		+ Widely supported and well-established method.
		+ Can provide additional metadata about the property, such as its configurable or writable status.
	* Cons:
		+ Additional overhead due to the extra step of accessing `.value`.
		+ May not be as efficient as `Reflect.get()` for small properties or simple access patterns.
2. **`Reflect.get(object, 'property')`**
	* Pros:
		+ More concise and expressive syntax.
		+ Efficient since it only performs a single operation to retrieve the property value.
	* Cons:
		+ Requires support for the JavaScript Reflect API, which may not be available in all browsers or environments.

**Library and Purpose**

In this benchmark, no external library is used. However, `Reflect` is part of the JavaScript standard library (ECMAScript 2022) and provides a set of APIs for working with objects and their properties.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes being tested in these benchmarks. The focus is on comparing two existing methods (`Object.getOwnPropertyDescriptor()` vs `Reflect.get()`) for accessing property values.

**Other Alternatives**

If you were to rewrite the benchmark using a different approach, some alternatives could be:

1. **Using `property` access directly**: Instead of calling `Object.getOwnPropertyDescriptor()` or `Reflect.get()`, one could use direct property access (`object.property`). This would likely result in the slowest execution time due to the lack of optimization and additional overhead.
2. **Using a library like Lodash or _**: Some libraries, such as Lodash, provide methods for accessing property values (e.g., `_.get()`) that might offer performance benefits over direct access or built-in methods.
3. **Implementing a custom accessor function**: One could write and use a custom accessor function to implement the desired behavior without relying on `Object.getOwnPropertyDescriptor()` or `Reflect.get()`. This would likely result in the fastest execution time, as it avoids the overhead of built-in methods.

Keep in mind that these alternatives might not offer significant performance benefits for simple access patterns, and the benchmark's results should be interpreted with caution when considering these alternatives.

Related benchmarks:

Object.getOwnPropertyDescriptor().value vs Reflect.get() (version: 0)

Comparing performance of: Object.getOwnPropertyDescriptor() vs Reflect.get()

Created: 3 years ago by: Guest

Jump to the latest result

Object.getOwnPropertyDescriptor()

Reflect.get()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):