Benchmark: Qry vs id 2 - MeasureThat.net

HTML Preparation code:

<div id='a'></div>

Tests:

Id
let b = document.getElementById('a')
Query
let b = document.querySelector('#a')
Direct (or woteva this way is meant to be called)
let b = a;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Id
Query
Direct (or woteva this way is meant to be called)

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested, compared, and discussed.

**Benchmark Definition**
The first part of the JSON represents the benchmark definition. It contains basic information about the benchmark:

* `Name`: "Qry vs id 2" - The name of the benchmark.
* `Description`: null - An empty description for the benchmark.
* `Script Preparation Code` and `Html Preparation Code`: These fields are left blank, indicating that no script or HTML preparation code is required to run this benchmark.

**Individual Test Cases**
The next part of the JSON contains three individual test cases:

1. `Benchmark Definition`: `let b = document.getElementById('a')`
	* `Test Name`: "Id" - The name of this specific test case.
2. `Benchmark Definition`: `let b = document.querySelector('#a')`
	* `Test Name`: "Query " - This is a single space, likely an error or placeholder. We'll assume it's meant to be "Query".
3. `Benchmark Definition`: `let b = a;` (note the typo: `woteva`)
	* `Test Name`: "Direct" (or the typo)

These test cases are comparing different approaches to retrieve an element from a DOM:

1. `document.getElementById('a')`
2. `document.querySelector('#a')`
3. A non-standard approach that's likely incorrect, using `let b = a;` (which is equivalent to `b = undefined`, since `a` is not defined).

**Comparing the Approaches**
The pros and cons of each approach are:

1. **`document.getElementById('a')`**:
	* Pros: Faster and more efficient for modern browsers, as it uses a direct selector.
	* Cons: May not work with older versions of Internet Explorer or other browsers that don't support this method.
2. **`document.querySelector('#a')`**:
	* Pros: More flexible and compatible with older browsers, but may be slower due to the additional overhead.
	* Cons: May require more computation to match elements, especially if there are many matching elements.
3. The non-standard approach `let b = a;` is likely incorrect, as it doesn't specify which element `a` refers to.

**Other Considerations**

* **Libraries**: None of the test cases use any external libraries beyond JavaScript's built-in DOM API.
* **Special JS features or syntax**: None are mentioned. However, if the benchmark were using modern ES6+ features like arrow functions, template literals, or classes, those would be worth noting.

**Alternatives**

Other approaches to retrieving elements from a DOM include:

1. `document.querySelectorAll('#a')`: Returns an array of all matching elements.
2. `Element.prototype.querySelector('#a')` or `Element.prototype.querySelectorAll('#a')`: These methods are more efficient than the native methods but require using prototype chaining.

Keep in mind that this benchmark is likely intended to compare the performance of different approaches in a specific scenario, rather than cover all possible cases or edge conditions.

Related benchmarks:

Qry vs id 2 (version: 0)

Comparing performance of: Id vs Query vs Direct (or woteva this way is meant to be called)

Created: 3 years ago by: Registered User

Jump to the latest result

Id

Query

Direct (or woteva this way is meant to be called)

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):