Benchmark: append for element vs append for elements

HTML Preparation code:

<div class='container'></div>

Script Preparation code:

window.container = document.querySelector('.container');

Tests:

append
const elements = [document.createElement('h1'), document.createElement('h2'), document.createElement('h3')]; elements.forEach((element)=>{ container.append(element) })
appendAll
const elements = [document.createElement('h1'), document.createElement('h2'), document.createElement('h3')]; container.append(...elements);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
append
appendAll

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches: appending a single element to a container vs appending multiple elements at once.

**Script Preparation Code**

```javascript
window.container = document.querySelector('.container');
```

This line of code selects an HTML element with the class "container" and assigns it to a global variable `window.container`. This is likely where the benchmark will append its test cases or results.

**Html Preparation Code**

```html
<div class='container'></div>
```

This line of code creates a new HTML element with the class "container". The container will be used as the target for appending elements during the benchmark.

**Individual Test Cases**

There are two individual test cases:

1. **append**
```javascript
const elements = [document.createElement('h1'), document.createElement('h2'), document.createElement('h3')];
elements.forEach((element) => {
  container.append(element);
});
```

This code creates an array of three HTML elements (h1, h2, and h3) using the `document.createElement` method. It then loops through each element in the array, appending it to the container using the `append` method.

2. **appendAll**
```javascript
const elements = [document.createElement('h1'), document.createElement('h2'), document.createElement('h3')];
container.append(...elements);
```

This code creates an array of three HTML elements (h1, h2, and h3) using the `document.createElement` method. It then uses the spread operator (`...`) to append all elements in the array directly to the container.

**Pros and Cons**

* **append**: 
  Pros:
	+ May be more intuitive for developers who are familiar with appending individual elements.
	+ Can be easier to debug, as each element is appended separately.
  Cons:
	+ May be slower, as it involves multiple function calls and updates to the DOM.

* **appendAll**:
  Pros:
	+ Can be faster, as it reduces the number of function calls and DOM updates required.
	+ Can improve performance by taking advantage of browser optimizations for appending multiple elements at once.
  Cons:
	+ May require more knowledge of modern JavaScript features (spread operator) to implement correctly.

**Library Usage**

There is no explicit library usage in these test cases. However, it's worth noting that `document.createElement` is a standard DOM method and does not rely on any specific libraries.

**Special JS Feature or Syntax**

The spread operator (`...`) used in the **appendAll** test case is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for concise array spreading, enabling developers to append multiple elements at once without explicitly looping through an array. This syntax may not be familiar to older JavaScript developers.

**Other Alternatives**

Some alternative approaches could include:

* Using `innerHTML` instead of `append` or `appendAll`. However, this would likely introduce security concerns and is generally discouraged.
* Implementing a custom loop for appending elements, such as using a `for` loop or a `while` loop. This would add extra complexity to the benchmark but may provide more control over performance optimization.

Overall, the benchmark provides a simple yet informative comparison of two common approaches to appending elements in JavaScript, highlighting the trade-offs between individual element appending and array-based appending.

Related benchmarks:

append for element vs append for elements (version: 1)

Comparing performance of: append vs appendAll

Created: 4 years ago by: Registered User

Jump to the latest result

append

appendAll

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):