Benchmark: __proto__ vs getPrototypeOf 2

Script Preparation code:

var proto1 = x => x.__proto__;
var proto2 = x => Object.getPrototypeOf(x);

Tests:

__proto__
proto1({}) proto1([]) proto1(123)
getPrototypeOf
proto2({}) proto2([]) proto2(123)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
__proto__
getPrototypeOf

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark measures the performance of two approaches to accessing the prototype chain of an object:

1. `proto1` function: This function uses the `__proto__` property to access the prototype chain of an object. It's a shorthand way of saying "get the prototype of this object" and is often used in older JavaScript versions.
2. `proto2` function: This function uses the `Object.getPrototypeOf()` method to access the prototype chain of an object.

**Options being compared**

The benchmark compares the performance of these two approaches:

* `__proto__`: The original, shorthand way of accessing the prototype chain.
* `getPrototypeOf`: A more explicit and modern way of accessing the prototype chain using a built-in function.

**Pros and Cons of each approach**

1. `__proto__`:
	* Pros:
		+ Faster and more efficient in older JavaScript versions (before ECMAScript 2015).
		+ Often used in legacy codebases.
	* Cons:
		+ Less readable and maintainable, as it's not a standard property access method.
		+ May cause issues with object serialization or cloning.
2. `getPrototypeOf`:
	* Pros:
		+ More explicit and modern way of accessing the prototype chain.
		+ Better support for object serialization, cloning, and manipulation.
		+ Follows ECMAScript 2015 and later standards.
	* Cons:
		+ Slightly slower than `__proto__` in older JavaScript versions.

**Library usage**

In this benchmark, no external libraries are used. The `proto1` and `proto2` functions rely on built-in JavaScript properties and methods (`__proto__` and `Object.getPrototypeOf()`, respectively).

**Special JS features or syntax**

There are no special JavaScript features or syntax being tested in this benchmark.

**Other alternatives**

If you want to compare the performance of these approaches, you might also consider testing with:

* `Object.create()` instead of `__proto__`
* `Reflect.setPrototypeOf()` instead of `getPrototypeOf`

However, keep in mind that these alternatives may not provide a direct comparison, as they have different use cases and characteristics.

**Benchmark preparation code**

The provided script preparation code defines two functions: `proto1` and `proto2`. These functions take an object (`x`) and return its prototype chain using either the `__proto__` property or the `Object.getPrototypeOf()` method, respectively. The code also defines a simple object literal `{}` and an empty array `[]` to be used as test cases.

**Individual test cases**

The benchmark has two individual test cases:

1. `__proto__`: Tests the performance of accessing the prototype chain using the `__proto__` property.
2. `getPrototypeOf`: Tests the performance of accessing the prototype chain using the `Object.getPrototypeOf()` method.

These test cases are designed to demonstrate the difference in performance between these two approaches on various inputs (objects, arrays).

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
__proto__	7575202.5 Ops/sec
getPrototypeOf	2708697.8 Ops/sec

Related benchmarks:

proto vs getPrototypeOf 2 (version: 0)

Comparing performance of: proto vs getPrototypeOf

Created: one year ago by: Registered User

Jump to the latest result

proto

getPrototypeOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

__proto__ vs getPrototypeOf 2 (version: 0)

Comparing performance of: __proto__ vs getPrototypeOf

Created: one year ago by: Registered User

Jump to the latest result

__proto__

getPrototypeOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

proto vs getPrototypeOf 2 (version: 0)

Comparing performance of: proto vs getPrototypeOf

proto