Benchmark: JS: prependtBefore vs appendChild

HTML Preparation code:

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

Script Preparation code:

var container = document.getElementById("container");
var paragraph = document.createElement("p");

Tests:

prepend
container.prepend(paragraph);
appendChild
container.appendChild(paragraph);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
prepend
appendChild

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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I'll explain the benchmark in detail, covering what's tested, the options compared, and other considerations.

**Benchmark Purpose**

The benchmark measures the performance difference between two approaches for inserting an HTML element into a container: `container.prepend(paragraph)` (prepend) versus `container.appendChild(paragraph)` (append).

**Options Compared**

Two JavaScript methods are being compared:

1. **prepend**: Using the `prepend` method of the DOM `Element` class, which inserts the new element at the beginning of the container's children.
2. **appendChild**: Using the `appendChild` method of the DOM `Element` class, which inserts the new element at the end of the container's children.

**Pros and Cons**

Here are some pros and cons for each approach:

*   **prepend**:
    *   Pros:
        *   Faster, as it only needs to traverse a shorter list of child nodes.
        *   Can be more efficient when dealing with a large number of elements in the container.
    *   Cons:
        *   May cause layout issues if not used carefully, especially in responsive design scenarios.
*   **appendChild**:
    *   Pros:
        *   Easier to understand and implement, as it's a more straightforward method.
        *   Less likely to cause layout issues compared to prepend.
    *   Cons:
        *   Slower, as it needs to traverse the entire list of child nodes.

**Library and Purpose**

In this benchmark, the `DOM` library is used, which provides an interface for manipulating HTML documents and creating new elements. The `Element` class within the `DOM` library represents a single element in an HTML document.

**JavaScript Feature/Syntax**

No special JavaScript features or syntax are used in this benchmark beyond what's necessary to implement the two approaches.

**Other Alternatives**

If you're interested in alternative methods for inserting elements into a container, consider the following:

*   **insertBefore**: Similar to `prepend`, but allows specifying a target element within which to insert the new element.
*   **insertAdjacentHTML**: A more modern method that uses template literals or string templates to render HTML content at specific positions relative to the DOM element.
*   **DOM Traversal APIs**: Instead of using methods like `appendChild` and `prepend`, you could explore using DOM traversal APIs like `querySelectorAll` or `getElementsByClassName` to navigate through elements.

By understanding these alternatives, you can choose the best approach for your use case based on performance, readability, and specific requirements.

Related benchmarks:

JS: prependtBefore vs appendChild (version: 0)

Comparing performance of: prepend vs appendChild

Created: 4 years ago by: Guest

Jump to the latest result

prepend

appendChild

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):