Benchmark: Test removeChild

HTML Preparation code:


<div id='container'></div>

Script Preparation code:

var container = document.getElementById('container');
ul = document.createElement('ul');
var html = [];
    for ( var i=0; i<2000; i += 1 ) {
  	html.push(`<li><p class="close_button">${i}</p></li>`);
}
 ul.innerHTML = html.join('');
 container.appendChild(ul);

Tests:

style
var closeBannerButtons = document.querySelectorAll('.close_button'); for(let closeButton of closeBannerButtons) { closeButton.addEventListener('click', function() { this.parentElement.style.display = 'none'; }); }
childElement
var closeBannerButtons = document.querySelectorAll('.close_button'); for(let closeButton of closeBannerButtons) { closeButton.addEventListener('click', function() { var banner_container = this.parentElement; banner_container.parentElement.removeChild(banner_container); }); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
style
childElement

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.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark measures the performance difference between two approaches to remove child elements from a DOM node: using the `style` attribute and using the `removeChild()` method directly.

**Script Preparation Code**

The script preparation code creates a container element with an unordered list (`ul`) as its child. The list contains 2000 list items, each with a close button link (`<p class="close_button">`). This setup simulates a scenario where you need to remove multiple elements from the DOM.

**Html Preparation Code**

The HTML preparation code simply includes a container element with an ID of "container", which is used as the parent node for the created unordered list.

**Individual Test Cases**

There are two test cases:

1. **style**: This test case uses the `style` attribute to remove the child elements. Specifically, it adds an event listener to each close button link that removes the entire parent element (`banner_container`) when clicked.
2. **childElement**: This test case uses the `removeChild()` method directly on the parent node (`banner_container`) to remove its child elements.

**Options Compared**

The two approaches are compared in terms of their performance impact:

* **style approach**: This approach relies on manipulating the DOM using CSS styles, which can be slower than other methods.
* **childElement approach**: This approach uses a more direct and efficient method to remove child elements from the DOM.

**Pros and Cons**

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

* **style approach**:
	+ Pros: Can be more concise and easier to read, as it uses CSS styles.
	+ Cons: Can be slower due to the overhead of manipulating the DOM using CSS rules.
* **childElement approach**:
	+ Pros: Generally faster, as it uses a direct method to remove child elements from the DOM.
	+ Cons: May require more code and be less concise.

**Library Used**

The test cases use `document.querySelectorAll()` to select all elements with the class "close_button", which is a built-in JavaScript method for selecting multiple elements based on their CSS class.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. Both approaches rely on standard DOM manipulation techniques.

**Other Alternatives**

If you're interested in exploring alternative methods to remove child elements from the DOM, consider the following:

* Using `element.remove()` (not supported in older browsers)
* Using a library like jQuery's `.remove()` method
* Using a custom implementation with a custom algorithm

Keep in mind that the best approach will depend on your specific use case and requirements.

Related benchmarks:

Test removeChild (version: 0)

Test removeChild

Comparing performance of: style vs childElement

Created: 4 years ago by: Guest

Jump to the latest result

style

childElement

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):