Benchmark: replaceWith vs replaceChild x1000 fix

HTML Preparation code:

<html>

  
  
</html>

Script Preparation code:

parentBox = document.createElement('div');
document.body.appendChild(parentBox);

Tests:

replaceWith
var Iframe1 = []; var Video1 = []; for (var i = 0; i < 1000; i++) { Iframe1[i] = document.createElement('iframe'); parentBox.appendChild(Iframe1[i]); Video1[i] = document.createElement('video'); } for (var w = 999; w > -1; w--) { Iframe1[w].replaceWith(Video1[w]); }
replaceChild
var Iframe2 = []; var Video2 = []; for (var i = 0; i < 1000; i++) { Iframe2[i] = document.createElement('iframe'); parentBox.appendChild(Iframe2[i]); Video2[i] = document.createElement('video'); } for (var c = 999; c > -1; c--) { parentBox.replaceChild(Video2[c], Iframe2[c]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replaceWith
replaceChild

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replaceWith	0.4 Ops/sec
replaceChild	0.2 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance of two approaches for replacing elements in a DOM:

1. `replaceWith`
2. `replaceChild`

Both approaches are used to replace an `iframe` element with a `video` element 1000 times in a loop.

**Options Compared**

The options being compared are:

1. **`replaceWith`**: Replaces the child node of an element using the `replaceWith()` method.
2. **`replaceChild`**: Replaces a child node of an element using the `replaceChild()` method, taking two arguments: the new child node and the old child node to be replaced.

**Pros and Cons**

### ReplaceWith

Pros:

* Simplistic and straightforward approach
* Can be more intuitive for developers who are familiar with HTML and CSS
* May be faster in some cases due to fewer browser optimizations

Cons:

* May not be as efficient as `replaceChild` because it involves creating a new DOM node and appending it to the parent element, which can lead to unnecessary DOM mutations.
* Can result in slower performance on modern browsers that optimize for `replaceChild`.

### ReplaceChild

Pros:

* More efficient than `replaceWith` because it only replaces the specified child node without creating a new DOM node or appending it to the parent element.
* Optimized by modern browsers for better performance.

Cons:

* Requires more knowledge of JavaScript and DOM manipulation, which can make it less intuitive for developers who are not familiar with these concepts.

**Library and Syntax**

In both benchmark cases, no libraries are explicitly mentioned. However, some syntax features specific to JavaScript/ECMAScript 5+ are used:

* `var` is used to declare variables.
* The `[]` syntax is used to create arrays (not arrays as in other languages).
* The `for` loop syntax is used for iteration.

**Other Considerations**

When evaluating the performance of these two approaches, it's essential to consider factors like:

* Browser optimizations: Modern browsers have optimized their DOM manipulation algorithms for better performance. In this case, `replaceChild` may be faster due to these optimizations.
* DOM mutation cost: Creating and appending a new DOM node can incur additional costs in terms of memory allocation, garbage collection, and repaints. This is less likely to happen when using `replaceChild`.
* Developer familiarity: The choice between `replaceWith` and `replaceChild` may depend on the developer's familiarity with JavaScript, DOM manipulation, and browser optimizations.

**Alternatives**

Other alternatives for replacing elements in a DOM could include:

* Using CSS transitions or animations instead of DOM manipulation
* Using libraries like React or Angular to manage DOM updates
* Using web workers to offload computationally expensive tasks from the main thread

Keep in mind that these alternatives may have different performance characteristics, complexity, and trade-offs compared to `replaceWith` and `replaceChild`.

Related benchmarks:

replaceWith vs replaceChild x1000 fix (version: 0)

replace dom

Comparing performance of: replaceWith vs replaceChild

Created: one year ago by: Guest

Jump to the latest result

replaceWith

replaceChild

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):