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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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.

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.

Related benchmarks:

$ Selector performance in JQuery 3 (version: 0)

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

Created: 6 years ago by: Registered User

Jump to the latest result

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3

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6

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):