Benchmark: Previous simple selector vs Current more complex selector

HTML Preparation code:

<label>Choose an option</label>
<div role='listbox'>
	<div data-qa-id='listbox-menu-with-possibly-long-id-1'></div>
</div>
<div role='listbox'>
	<div data-qa-id='listbox-menu-with-possibly-long-id-2'></div>
</div>
<div role='listbox'>
	<div data-qa-id='listbox-menu-with-possibly-long-id-3'></div>
</div>

Script Preparation code:

const menu1 = document.querySelector(`[data-qa-id='listbox-menu-with-possibly-long-id-1']`);
for (let i = 1; i <= 30; i++) {
    menu1.appendChild(createOptionItem(`Option ${i}`, 1));
}

const menu2 = document.querySelector(`[data-qa-id='listbox-menu-with-possibly-long-id-2']`);
for (let i = 1; i <= 12; i++) {
    menu2.appendChild(createOptionItem(`Option ${i}`, 2));
}

const menu3 = document.querySelector(`[data-qa-id='listbox-menu-with-possibly-long-id-3']`);
for (let i = 1; i <= 125; i++) {
    menu3.appendChild(createOptionItem(`Option ${i}`, 3));
}

function createOptionItem(content, menuType) {
    let optionItem = document.createElement('div');
    optionItem.setAttribute("class", `option${menuType}`);
    optionItem.setAttribute("role", "option");
    optionItem.textContent = content;
    return optionItem;
}

Tests:

Simpler selector
const options1 = document.querySelectorAll(`[class='option1']`); for (option of options1) { if (option.innerText === 'Option 30') { console.log(option); } } const options2 = document.querySelectorAll(`[class='option2']`); for (option of options2) { if (option.innerText === 'Option 12') { console.log(option); } } let options3 = document.querySelectorAll(`[class='option3']`); for (option of options3) { if (option.innerText === 'Option 125') { console.log(option); } }
More complex selector
let options1 = document.querySelectorAll(`[data-qa-id='listbox-menu-with-possibly-long-id-1'] [role='option']`); for (option of options1) { if (option.innerText === 'Option 30') { console.log(option); } } let options2 = document.querySelectorAll(`[data-qa-id='listbox-menu-with-possibly-long-id-2'] [role='option']`); for (option of options2) { if (option.innerText === 'Option 12') { console.log(option); } } let options3 = document.querySelectorAll(`[data-qa-id='listbox-menu-with-possibly-long-id-3'] [role='option']`); for (option of options3) { if (option.innerText === 'Option 125') { console.log(option); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Simpler selector
More complex selector

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark tests two different approaches to selecting elements in JavaScript: simpler selectors and more complex selectors. The goal is to compare the performance of these two approaches on various browsers and devices.

**Simpler Selector (Individual Test Case)**

In this test case, the selector uses a single class attribute `class='option1'` to select all elements with that class. However, the code only checks for an element's text content (`option.innerText`) instead of its value or innerHTML. This is likely a simplified version of the actual use case.

The pros of using simpler selectors are:

* Easier to write and maintain
* Less CPU-intensive

However, this approach has some cons:

* May not work correctly if the element doesn't have a `value` property or an innerHTML that matches the expected value
* Can be slower than more complex selectors for large datasets

**More Complex Selector (Individual Test Case)**

In this test case, the selector uses multiple attributes (`data-qa-id='listbox-menu-with-possibly-long-id-1'` and `role='option'`) to select all elements that match both conditions. This is a more common use case for selecting elements in JavaScript.

The pros of using more complex selectors are:

* More accurate and reliable, as it takes into account multiple attributes
* Can be faster than simpler selectors for large datasets

However, this approach has some cons:

* More difficult to write and maintain
* Can be CPU-intensive

**Library Usage**

In the benchmark preparation code, there is a function `createOptionItem(content, menuType)` that creates an HTML element with a specific class attribute. This is likely a custom library or utility function used in the test cases.

The purpose of this library is to create a standard set of elements for testing the selector performance.

**Special JS Features or Syntax**

There are no special JS features or syntax mentioned in the benchmark.

**Alternative Approaches**

Other alternatives to consider when selecting elements in JavaScript include:

1. Using query selectors with multiple attributes: `document.querySelectorAll('[data-qa-id="listbox-menu-with-possibly-long-id-1"] [role="option"]')`
2. Using CSS selectors: `document.querySelector('[data-qa-id="listbox-menu-with-possibly-long-id-1"]:has([role="option"])')`
3. Using a library like jQuery: `$('.option').filter(function() { return this.innerText === 'Option 30'; })`

These alternatives may offer better performance or accuracy in certain scenarios, but their usage and complexity vary.

**Benchmarking Considerations**

When benchmarking JavaScript performance, it's essential to consider factors such as:

1. Browser and device compatibility
2. Network latency and connection type (e.g., Wi-Fi, Ethernet)
3. CPU and memory constraints
4. Algorithmic optimizations and caching
5. Use of external libraries or frameworks

By considering these factors, you can design effective benchmarking tests that accurately reflect real-world performance scenarios.

Related benchmarks:

Previous simple selector vs Current more complex selector (version: 5)

Comparing performance of: Simpler selector vs More complex selector

Created: 3 years ago by: Registered User

Jump to the latest result

Simpler selector

More complex selector

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):