Benchmark: jQuery class selector

HTML Preparation code:

<div id='curBody1'>
  <div>
    <span>
      <div>
        This is a div we're NOT looking for.
      </div>
    </span>
  </div>
</div>
<div id='curBody2'>
  <div>
    <span>
      <div class='desired-element'>
        This is the div we're looking for.
      </div>
    </span>
  </div>
</div>

Script Preparation code:

var curElement = null;

Tests:

Id and class chaining selector
curElement = $('#curBody2 .desired-element');
Class selector only
curElement = $('.desired-element');
Id selector then .find
curElement = $('#curBody2').find('.desired-element');
Class selector using parent element
curElement = $('.desired-element',$('#curBody2'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Id and class chaining selector
Class selector only
Id selector then .find
Class selector using parent element

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking scenario.

**Benchmark Definition JSON**

The benchmark is designed to test the performance of different approaches when selecting an element using its class versus getting a handle on the parent element and then navigating to the child.

**Options Compared**

There are four options compared:

1. **Id and Class Chaining Selector**: This approach involves using both an ID selector (`#`) and a class selector (`.`) in a single query.
2. **Class Selector Only**: This approach uses only a class selector (`.`).
3. **ID Selector then .find**: This approach involves using an ID selector (`#`) followed by the `.find()` method to find the child element with the specified class.
4. **Class Selector using Parent Element**: This approach involves getting a handle on the parent element and then navigating to the child element using a class selector.

**Pros and Cons**

* **Id and Class Chaining Selector**: This approach can be efficient when both IDs and classes are available, as it allows for a single query. However, if the ID is not unique or does not exist, this approach may fail.
* **Class Selector Only**: Using only a class selector can be slower than using an ID selector, especially if the class name is long or complex.
* **ID Selector then .find**: This approach can be useful when there are multiple elements with the same class and you need to find a specific one. However, it may require additional processing time.
* **Class Selector using Parent Element**: This approach requires more processing steps, as it involves getting a handle on the parent element before navigating to the child element.

**Library Usage**

The `jQuery` library is used in all benchmark cases. Specifically:

* `$('#curBody2 .desired-element')`: Uses an ID selector followed by a class selector (`.$`) to select the desired element.
* `$('.desired-element')`: Uses a class selector alone to select the desired element.
* `$('#curBody2').find('.desired-element')`: Uses an ID selector followed by the `.find()` method to find the child element with the specified class.
* `$('.desired-element,$('#curBody2'))`: Uses a class selector followed by a parent selector (`.$`) to select the desired element.

**Special JS Feature/Syntax**

There is no explicit mention of special JavaScript features or syntax in the benchmark definition. However, the use of `jQuery` and its methods (e.g., `.find()`, `.$()`) assumes that the test environment has jQuery installed.

**Other Alternatives**

If the test were to be run without using jQuery, alternative approaches might include:

* Using vanilla JavaScript methods (e.g., `document.querySelector()` or `document.getElementById()`)
* Utilizing other libraries (e.g., React or Angular) for DOM manipulation
* Employing CSS selectors (e.g., `:has()` or `>`)

Keep in mind that these alternatives would likely require significant modifications to the benchmark definition and implementation.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

Browser/OS: Chrome 52 on Windows

View result in a separate tab

Test name	Executions per second
Id and class chaining selector	101175.7 Ops/sec
Class selector only	530380.3 Ops/sec
Id selector then .find	394325.8 Ops/sec
Class selector using parent element	350893.0 Ops/sec

Related benchmarks:

jQuery class selector (version: 0)

This will test the difference between selecting an element using its class vs getting a handle on the parent element and then navigating to the child.

Comparing performance of: Id and class chaining selector vs Class selector only vs Id selector then .find vs Class selector using parent element

Created: 8 years ago by: Guest

Jump to the latest result

Id and class chaining selector

Class selector only

Id selector then .find

Class selector using parent element

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):