Benchmark: $ Selector performance in JQuery 3

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://code.jquery.com/jquery-3.4.1.min.js'></script>

Script Preparation code:

$('.my-class')
jQuery('.my-class')
$('div.my-class')
jQuery('div.my-class')
$('#my-id').find('.my-class')
jQuery('#my-id').find('.my-class')

Tests:

1
$('.my-class')
2
jQuery('.my-class')
3
$('div.my-class')
4
jQuery('div.my-class')
5
$('#my-id').find('.my-class')
6
jQuery('#my-id').find('.my-class')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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2
3
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5
6

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its components, explaining what's being tested, compared, and the pros and cons of each approach.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test case on MeasureThat.net. The test focuses on comparing different ways to select elements in jQuery (a popular JavaScript library) and measuring their performance.

**What is being tested?**

There are six individual test cases, each comparing two different methods of selecting an element using jQuery:

1. `$('.my-class')` vs. `jQuery('.my-class')`
2. `$('div.my-class')` vs. `jQuery('div.my-class')`
3. `$('#my-id').find('.my-class')` vs. `jQuery('#my-id').find('.my-class')`

The test is designed to measure the execution speed of each method on a specific HTML structure.

**Options compared**

Let's break down each option:

* **1. `$('.my-class')`**: This is a shorthand method of selecting elements using jQuery, where `.` is used as the alias for `document.querySelector`.
	+ Pros: Simple and concise syntax.
	+ Cons: May not work as expected if the element name is ambiguous (e.g., multiple elements with class `my-class`).
* **2. `jQuery('.my-class')`**: This method explicitly invokes jQuery's function to select elements, which may provide more control over the selection process.
	+ Pros: Provides more flexibility and can handle edge cases where `$()` would fail.
	+ Cons: Requires an explicit call to jQuery, which might add overhead due to its size.
* **3. `$('div.my-class')`**: Similar to option 1 but uses a different selector syntax.
	+ Pros: Simple and concise syntax.
	+ Cons: May not work as expected if the element name is ambiguous (e.g., multiple elements with class `my-class`).
* **4. `jQuery('div.my-class')`**: Similar to option 2, but uses an explicit call to jQuery's function to select elements.
	+ Pros: Provides more flexibility and can handle edge cases where `$()` would fail.
	+ Cons: Requires an explicit call to jQuery, which might add overhead due to its size.
* **5. `$('#my-id').find('.my-class')`**: This option uses a combination of `#` (id) and `.find()` methods to select the element.
	+ Pros: Can handle scenarios where multiple elements have the same class but different ids.
	+ Cons: May add overhead due to the use of multiple method calls.
* **6. `jQuery('#my-id').find('.my-class')`**: Similar to option 5, but uses an explicit call to jQuery's function.
	+ Pros: Provides more flexibility and can handle edge cases where `$()` would fail.
	+ Cons: Requires an explicit call to jQuery, which might add overhead due to its size.

**Library**

The test case uses the jQuery library, which is a popular JavaScript library for DOM manipulation and event handling. Its purpose is to simplify the process of working with HTML documents and provide a consistent API across different browsers.

**Special JS features or syntax**

There are no special JS features or syntax mentioned in this benchmark that would require in-depth explanation.

**Alternatives**

If you're looking for alternatives to MeasureThat.net, here are some options:

1. **Benchmark.js**: A lightweight JavaScript benchmarking library that allows you to create custom benchmarks.
2. **jsbench**: An online tool for creating and sharing JavaScript benchmarks.
3. **Benchpress**: A popular testing framework for JavaScript applications that includes built-in support for benchmarking.

Keep in mind that each of these alternatives has its own strengths and weaknesses, and the choice ultimately depends on your specific needs and preferences.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

Browser/OS: Firefox 68 on Windows

View result in a separate tab

Test name	Executions per second
1	245268.0 Ops/sec
2	289929.7 Ops/sec
3	145001.5 Ops/sec
4	146397.0 Ops/sec
5	212112.8 Ops/sec
6	217427.3 Ops/sec

Related benchmarks:

$ Selector performance in JQuery 3 (version: 0)

Comparing performance of: 1 vs 2 vs 3 vs 4 vs 5 vs 6

Created: 5 years ago by: Registered User

Jump to the latest result

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Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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