Benchmark: Test Append Methods

HTML Preparation code:

<table class="old">
	<tbody>
		<tr>
			<td class="old-td">old-td</td>
		</tr>
	</tbody>
</table>

<table class="new">
	<tbody>
		<tr class="new-tr">
		</tr>
	</tbody>
</table>

Script Preparation code:

var table_td = document.getElementsByClassName('old-td')[0],
    table_new_tr = document.getElementsByClassName('new-tr')[0];

Tests:

append
table_new_tr.append(table_td);
insertAdjacentElement (append)
table_new_tr.insertAdjacentElement('beforeend', table_td);
appendChild
table_new_tr.appendChild(table_td)
prepend
table_new_tr.prepend(table_td)
insertAdjacentElement (prepend)
table_new_tr.insertAdjacentElement('afterbegin', table_td);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
append
insertAdjacentElement (append)
appendChild
prepend
insertAdjacentElement (prepend)

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36 Edg/96.0.1054.53

Browser/OS: Chrome 96 on Windows

View result in a separate tab

Test name	Executions per second
append	1305928.4 Ops/sec
insertAdjacentElement (append)	1585169.1 Ops/sec
appendChild	1672582.9 Ops/sec
prepend	1489159.1 Ops/sec
insertAdjacentElement (prepend)	1668259.1 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the test cases and explain what's being tested, the options compared, pros and cons of each approach, and any notable library or syntax used.

**Benchmark Overview**

The test cases are designed to measure the performance of different methods for appending elements to an HTML table. There are four methods being compared:

1. `append()`
2. `insertAdjacentElement('beforeend')` (which is essentially equivalent to `appendChild`)
3. `appendChild()`
4. `prepend()`

**Options Compared**

The options are compared in terms of their execution time, with the fastest method winning.

**Pros and Cons of Each Approach**

1. **append()**: This method appends an element to the end of a collection without modifying its index. It's generally considered the most efficient way to append elements.
	* Pros: Easy to use, efficient.
	* Cons: May cause indices to become invalid if not handled carefully.
2. **insertAdjacentElement('beforeend')** (equivalent to `appendChild`): This method inserts an element before the end of a collection without modifying its index.
	* Pros: Similar to `append()`, easy to use.
	* Cons: Creates an extra DOM node, which can increase memory usage and cause performance issues if not handled carefully.
3. **appendChild()**: This method appends an element to the end of a collection and updates the index of all elements after it.
	* Pros: Updates indices correctly, efficient.
	* Cons: May be slower than `append()` due to the additional work required to update indices.
4. **prepend()**: This method prepends an element to the beginning of a collection without modifying its index.
	* Pros: Easy to use for certain use cases (e.g., adding a new element at the beginning).
	* Cons: May cause indices to become invalid if not handled carefully, slower than `append()`.

**Library and Syntax**

None of the test cases explicitly use any libraries or syntax. They only use standard JavaScript DOM API methods.

**Special JS Features**

The benchmark does not mention any special JS features or syntax. However, it's worth noting that some browsers may have implemented new methods for appending elements to collections (e.g., `Element.append()`), but these are not currently supported by older browsers.

**Other Alternatives**

If you needed to append elements to a collection without using the DOM API, you could consider using:

1. **Array.prototype.push()**: Adds an element to the end of an array.
2. **Array.prototype.unshift()**: Adds an element to the beginning of an array.
3. **NodeList.prototype.addItem()**: Appends an item to the end of a NodeList (not as widely supported as DOM APIs).

Keep in mind that these alternatives may have different performance characteristics and usage patterns compared to using the DOM API methods.

**Benchmark Interpretation**

The benchmark results show that `appendChild()` is generally the fastest method, followed closely by `append()`. However, it's essential to consider the trade-offs between execution time and memory usage, as `insertAdjacentElement('beforeend')` creates an extra DOM node.

Related benchmarks:

Test Append Methods (version: 0)

Comparing performance of: append vs insertAdjacentElement (append) vs appendChild vs prepend vs insertAdjacentElement (prepend)

Created: 3 years ago by: Registered User

Jump to the latest result

append

insertAdjacentElement (append)

appendChild

prepend

insertAdjacentElement (prepend)

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):