Benchmark: jquery level selector

HTML Preparation code:

<div id="test">
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
 <div class="level1"><div class="level2"></div></div>
</div>

Tests:

find .level2
$('#test').find('.level2');
find div.level2
$('#test').find('div.level2');
children .level1 .level2
$('#test').children('.level1').children('.level2');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find .level2
find div.level2
children .level1 .level2

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance of JavaScript selectors in different browsers and devices. The test cases are designed to simulate real-world scenarios where elements on a webpage need to be selected using CSS-like selectors.

**Script Preparation Code**

The script preparation code is empty, which means that the benchmark starts from scratch with no existing context or variables.

**Html Preparation Code**

The HTML preparation code creates a simple webpage with multiple nested `div` elements, structured as follows:

* `test` (outermost container)
	+ `level1` (first-level container)
		- `level2` (second-level container)

This structure is repeated multiple times to create a large number of nested elements.

**Test Cases**

There are three test cases that compare different selector approaches:

1. **`find .level2`**: This test case uses the `.find()` method to select all elements with the class `level2`.
2. **`find div.level2`**: This test case uses a more verbose approach, selecting elements with the exact string `div.level2`. Note that this is not the most efficient way to select an element.
3. **`children .level1 .level2`**: This test case uses the `.children()` method to first select all elements with the class `level1`, and then selects all nested `level2` elements.

**Libraries Used**

None of the tests use a JavaScript library, so we won't discuss any specific libraries here.

**Special JavaScript Features or Syntax**

There are no special features or syntax used in this benchmark. The selectors are standard JavaScript methods that can be used by any JavaScript engine.

**Pros and Cons of Different Approaches**

Here's a brief summary of the pros and cons of each approach:

1. **`find .level2`**: Pros: concise, efficient; Cons: may not work with older browsers or versions that don't support `find()`.
2. **`find div.level2`**: Pros: explicit, easy to understand; Cons: verbose, inefficient.
3. **`children .level1 .level2`**: Pros: readable, expressive; Cons: less efficient than the first approach.

**Other Alternatives**

If you were to rewrite this benchmark, you could consider alternative approaches, such as:

* Using a CSS selector library like Sizzle or CSSOM
* Implementing your own custom selector engine
* Using a different data structure for the nested elements (e.g., an object instead of a DOM tree)

Keep in mind that these alternatives would likely require significant changes to the benchmark and its results.

Related benchmarks:

jquery level selector (version: 0)

Comparing performance of: find .level2 vs find div.level2 vs children .level1 .level2

Created: 9 years ago by: Guest

Jump to the latest result

find .level2

find div.level2

children .level1 .level2

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):