Benchmark: Selector performance in JQuery

HTML Preparation code:

<div id="my-id">
    <div class="grand">
        <div class="parent"> Awesome stuff! </div>
        <div class="my-class">
            <p> I like carrots! </p>
        </div>
    </div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Script Preparation code:

console.log("$(' div#my-id div.grand div.parent div.my-class ')"); //case-1
console.log("$(' #my-id .grand .parent div.my-class ')"); //case-2
console.log("$(' #my-id .grand .parent .my-class ')" ); //case-3
console.log("$(' div#my-id div.my-class ')" ); //case-4
console.log("$(' #my-id div.my-class ')" ); //case-5
console.log("$(' #my-id .my-class ')" ); //case-6
console.log("$(' div.my-class ')" ); //case-7
console.log("$(' .my-class ')" ); //case-8

Tests:

case-1
console.log("$(' div#my-id div.grand div.parent div.my-class ')");
case-2
console.log("$(' #my-id .grand .parent div.my-class ')");
case-3
console.log("$(' #my-id .grand .parent .my-class ')" );
case-4
console.log("$(' div#my-id div.my-class ')" );
case-5
console.log("$(' #my-id div.my-class ')" );
case-6
console.log("$(' #my-id .my-class ')" );
case-7
console.log("$(' div.my-class ')" );
case-8
console.log("$(' .my-class ')" );

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
case-1
case-2
case-3
case-4
case-5
case-6
case-7
case-8

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'm excited to dive into this benchmark and explain the test cases.

**Benchmark Overview**

The provided JSON represents a microbenchmark that tests the performance of different CSS selector syntaxes in jQuery. The benchmark consists of 8 test cases, each with a specific CSS selector syntax that is executed using the `console.log` function.

**Test Cases**

Each test case measures the execution time of a single CSS selector syntax. Here's a brief summary of each test case:

1. **case-1**: `$(' div#my-id div.grand div.parent div.my-class ')`
2. **case-2**: `$(' #my-id .grand .parent div.my-class ')`
3. **case-3**: `$(' #my-id .grand .parent .my-class ')`
4. **case-4**: `$(' div#my-id div.my-class ')`
5. **case-5**: `$(' #my-id .my-class ')`
6. **case-6**: `$(' div.my-class ')`
7. **case-7**: `$(' .my-class ')`
8. **case-8**: `$( '.my-class ' )`

**Options Compared**

The benchmark compares the performance of different CSS selector syntaxes, including:

* Using IDs (`#`) vs. class names (`.`)
* Using single quotes vs. double quotes
* Using multiple selectors in a single query

**Pros and Cons of Different Approaches**

1. **Using IDs**: Pros: faster execution times due to the specificity of IDs; Cons: limited flexibility, as IDs are usually unique.
2. **Using Class Names**: Pros: more flexible than IDs, as class names can be reused; Cons: slower execution times compared to IDs.
3. **Single Quotes vs. Double Quotes**: This test case is not relevant in this benchmark, as both single and double quotes have the same performance characteristics.

**Library Used**

The library used in this benchmark is jQuery, a popular JavaScript library for DOM manipulation and event handling.

**Special JS Feature/ Syntax**

This benchmark does not specifically test any special JavaScript features or syntax. However, it does rely on jQuery's CSS selector functionality, which uses these syntaxes to select elements in the DOM.

**Other Alternatives**

If you're interested in exploring alternative libraries or implementations for this type of benchmark, you could consider:

1. **Vanilla JavaScript**: Using native JavaScript methods (e.g., `querySelector`, `querySelectorAll`) instead of jQuery.
2. **CSSOM**: Using the CSS Object Model (CSSOM) API to manipulate styles and select elements.

Keep in mind that these alternatives may have different performance characteristics, and this benchmark is specifically designed to test jQuery's CSS selector functionality.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0

Browser/OS: Firefox 61 on Ubuntu

View result in a separate tab

Test name	Executions per second
case-1	41090.3 Ops/sec
case-2	40613.1 Ops/sec
case-3	40972.7 Ops/sec
case-4	40263.4 Ops/sec
case-5	40769.8 Ops/sec
case-6	41076.9 Ops/sec
case-7	36707.3 Ops/sec
case-8	38705.2 Ops/sec

Related benchmarks:

Selector performance in JQuery (version: 0)

Comparing performance of: case-1 vs case-2 vs case-3 vs case-4 vs case-5 vs case-6 vs case-7 vs case-8

Created: 6 years ago by: Guest

Jump to the latest result

case-1

case-2

case-3

case-4

case-5

case-6

case-7

case-8

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):