Benchmark: Speed Compare: Check window for document object

Tests:

getOwnPropertyNames
Object.getOwnPropertyNames(window).includes('document');
getOwnPropertyDescriptors
'document' in Object.getOwnPropertyDescriptors(window);

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Suite status: <idle, ready to run>

Previous results

Test case name	Result
getOwnPropertyNames
getOwnPropertyDescriptors

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its various components.

**What is being tested?**

The test is comparing two different ways of checking if the `document` object exists in the browser's global scope. The tests are:

1. Using `Object.getOwnPropertyNames(window).includes('document')`
2. Using `'document' in Object.getOwnPropertyDescriptors(window)` (note that this syntax uses a "truthy" value to check if the property exists, rather than the property itself)

**Options compared**

The two options being compared are:

1. **Method 1:** `Object.getOwnPropertyNames(window).includes('document')`
	* This method uses the `getOwnPropertyNames()` method to get an array of all properties owned by the `window` object, and then checks if `'document'` is included in that array using the `includes()` method.
2. **Method 2:** `'document' in Object.getOwnPropertyDescriptors(window)`
	* This method uses the `getOwnPropertyDescriptors()` method to get an object containing metadata for all properties owned by the `window` object, and then checks if the property `'document'` exists as a key in that object using the "in" operator.

**Pros and cons of each approach**

1. **Method 1:**
	* Pros:
		+ More intuitive and readable syntax
		+ Easy to understand for developers familiar with the `includes()` method
	* Cons:
		+ May be slower due to the overhead of calling `getOwnPropertyNames()`
		+ May not work as expected in older browsers that don't support modern ECMAScript features
2. **Method 2:**
	* Pros:
		+ More efficient and faster, since it uses a built-in object property check
		+ Less likely to produce unexpected results in older browsers
	* Cons:
		+ Syntax may be less intuitive for developers unfamiliar with the "in" operator on objects
		+ May require additional libraries or polyfills if not supported by all browsers

**Library and its purpose**

In this benchmark, the `Object` library is used to provide access to various object-related methods and properties, such as `getOwnPropertyNames()` and `getOwnPropertyDescriptors()`. These methods are part of the ECMAScript standard and are available in most modern browsers.

**Special JavaScript feature or syntax**

Neither test case uses any special JavaScript features or syntax that requires specific knowledge or expertise. The syntax used is straightforward and easy to understand, making it accessible to a wide range of developers.

**Alternatives**

If you're looking for alternative ways to check if the `document` object exists in a browser, some options include:

1. Using a simple property access, such as `window.document`
2. Using a library or polyfill that provides a more robust and reliable way to access the `document` object, such as a polyfill for `window.document`
3. Implementing your own custom solution using JavaScript and browser-specific APIs.

However, in this specific benchmark, Method 1 and Method 2 are the only two approaches being compared, so these alternatives may not be directly relevant.

Related benchmarks:

Speed Compare: Check window for document object (version: 0)

Test1: Object.getOwnPropertyNames(window).includes('document') Test2: 'document' in Object.getOwnPropertyDescriptors(window)

Comparing performance of: getOwnPropertyNames vs getOwnPropertyDescriptors

Created: 4 years ago by: Guest

Jump to the latest result

getOwnPropertyNames

getOwnPropertyDescriptors

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):