Benchmark: remove lastChild vs replaceWith

HTML Preparation code:

<div id="container">
  <div>Content</div>
  <div>Content</div>
  <div>Content</div>
</div>

Script Preparation code:

var container = document.getElementById('container');

Tests:

remove lastChild
while (container.lastChild) { container.lastChild.remove(); }
replaceWith
container.replaceWith();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
remove lastChild
replaceWith

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser/OS: Chrome 104 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
remove lastChild	22736274.0 Ops/sec
replaceWith	19140388.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Description:**

The benchmark is designed to compare two approaches for removing child elements from a container element in JavaScript:

1. `remove lastChild`: This approach iterates through the container's children using a `while` loop, removing each child element until there are no more.
2. `replaceWith`: This approach uses the `replaceWith()` method to replace the entire content of the container with new elements.

**Options Compared:**

The benchmark is comparing these two approaches:

1. **Iterative removal (`remove lastChild`)**:
	* Pros:
		+ Can be used when you need more control over the removal process.
		+ May perform better for small to medium-sized containers.
	* Cons:
		+ Can be slower and more memory-intensive for large containers.
		+ Requires manual iteration, which can lead to bugs if not implemented correctly.
2. **Replacement (`replaceWith`)**:
	* Pros:
		+ Faster and more efficient than iterative removal.
		+ Easier to implement and less prone to errors.
	* Cons:
		+ May require more overhead due to the replacement process.

**Library Used:**

In this benchmark, no specific JavaScript library is used. However, some browsers may have internal optimizations or built-in methods that can affect performance.

**Special JS Features/Syntax:**

There are none mentioned in this benchmark.

**Other Alternatives:**

If you need to remove child elements from a container element, here are some alternative approaches:

1. `appendChild(null)`: This method removes the last child element and returns it.
2. `removeChild()`: This method directly removes the specified child element.
3. Using `Array.prototype.filter()` or `Array.prototype.splice()`: These methods can be used to remove elements from an array-like object, but may not work directly on DOM elements.

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

**Benchmark Preparation Code:**

The preparation code creates a container element with three child elements, each containing the text "Content". This setup allows for a realistic test scenario.

```javascript
var container = document.getElementById('container');
```

**Individual Test Cases:**

Each test case is defined by its benchmark definition (the `while` loop or `replaceWith()` method) and a descriptive name ("remove lastChild" or "replaceWith").

In the provided example, there are only two test cases:

1. `remove lastChild`: This test case uses the `while` loop to remove child elements until there are no more.
2. `replaceWith`: This test case uses the `replaceWith()` method to replace the entire content of the container with new elements.

The benchmark result shows the performance metrics for each test case, including executions per second and browser information.

Related benchmarks:

remove lastChild vs replaceWith (version: 0)

Comparing performance of: remove lastChild vs replaceWith

Created: 2 years ago by: Guest

Jump to the latest result

remove lastChild

replaceWith

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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