Benchmark: querySelector3 - MeasureThat.net

HTML Preparation code:

<div id="test">12345</div>

Script Preparation code:

var D = document;

function A(V){
	return document.querySelector(V);
}

function B(V){
	return D.querySelector(V);
}

Tests:

1
const X = document.querySelector("#A");
2
const X = D.querySelector("#A");
3
const Z = A("#A");
4
const Z = B("#A");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2
3
4

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Windows

View result in a separate tab

2.4M/s

2.3M/s

1.4M/s

716K/s

View exact numbers

Test name	Executions per second
✓ 1	2,369,476 Ops/sec
2	2,335,858 Ops/sec
4	1,359,024 Ops/sec
3	715,891 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition JSON**

The provided Benchmark Definition JSON defines a simple JavaScript function `A` and another function `B` that both query an HTML element using `document.querySelector`. The Script Preparation Code sets up the `D` variable, which is an alias for `document`, to simplify the comparison between the two functions. The Html Preparation Code creates a basic HTML structure with a single div element.

**Options Compared**

The benchmark compares four different options:

1. **`A(V)`**: Calls the `querySelector` method directly on the `D` (aliased `document`) variable.
2. **`B(V)`**: Calls the `querySelector` method on the `D` (aliased `document`) variable, but uses the deprecated `querySelector` property instead of the modern `querySelector`.
3. **`const X = document.querySelector("#A");`**: Uses the modern `querySelector` method to select an element with the id "A".
4. **`const Z = D.querySelector("#A");`**: Similar to option 2, but uses the same alias (`D`) as in function `B`.

**Pros and Cons**

Here's a brief analysis of each option:

* **Option 1 (A(V))**: Pros - simple and direct; Cons - uses deprecated property.
* **Option 2 (B(V))**: Pros - uses modern property; Cons - still uses an older version, and `D` alias might lead to confusion.
* **Option 3 (const X = document.querySelector("#A"));**: Pros - modern method, clear intent; Cons - assumes the element with id "A" exists in the HTML structure.
* **Option 4 (const Z = D.querySelector("#A");)**: Pros - similar to A(V), but with alias `D`; Cons - same as B(V), using deprecated property.

**Library and Syntax**

In this benchmark, there is no explicit library or framework being used. However, the use of `querySelector` suggests that it's being compared against a modern JavaScript environment.

No special JS features or syntax are mentioned in the Benchmark Definition JSON.

**Alternatives**

If you want to compare similar benchmarks with different options, here are some alternatives:

* Use a more complex HTML structure with multiple elements and varying nesting levels.
* Compare different CSS selectors (e.g., `querySelector` vs. `getElementsByClassName`).
* Use a different alias for the `document` variable (e.g., `doc`) or an alternative naming convention.
* Introduce additional variables or functions to make the benchmark more complex.

Keep in mind that when creating benchmarks, it's essential to ensure that the test cases are representative of real-world scenarios and that the options being compared have similar intent.

querySelector3 (version: 0)

Comparing performance of: `1 vs 2 vs 3 vs 4`

Created: 2 years ago by: Guest

Go to the latest result

1

2

3

4

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

querySelector3 (version: 0)

Comparing performance of: 1 vs 2 vs 3 vs 4

Created: 2 years ago by: Guest

Go to the latest result

1

2

3

4

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `1 vs 2 vs 3 vs 4`