Benchmark: Cost of adding and removing events

HTML Preparation code:


<div id='element'></div>

Script Preparation code:

const element = document.getElementById('element');

Tests:

Adding and removing event listeners
const callback = () => { console.log('x') } element.addEventListener('click', callback); element.removeEventListener('click', callback);
Null
null

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Adding and removing event listeners
Null

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
Adding and removing event listeners	2759039.5 Ops/sec
Null	129327048.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON benchmark definition, test cases, and latest benchmark result.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that tests the cost of adding and removing events from an HTML element. Here's what's being tested:

* A callback function `callback` is defined to log the string 'x' to the console.
* The element with the ID "element" is retrieved using `document.getElementById('element')`.
* An event listener is added to the element, passing the `callback` function as an argument. This is done using the `addEventListener` method.
* Immediately after adding the event listener, another event listener is removed from the same element, also passing the same `callback` function.

The benchmark definition script preparation code and HTML preparation code are provided, allowing users to run the benchmark with a specific setup.

**Options compared**

In this benchmark, two main options are being compared:

1. **Adding an event listener**: This involves calling the `addEventListener` method on the element.
2. **Removing an event listener**: This involves calling the `removeEventListener` method on the same element.

**Pros and Cons of those different approaches**

* Adding an event listener:
	+ Pros: Can be more flexible, allowing for multiple listeners to be attached to a single event type.
	+ Cons: May incur additional overhead due to the creation of a new listener object.
* Removing an event listener:
	+ Pros: Reduces memory usage by removing a listener that is no longer needed.
	+ Cons: May require additional checks to ensure the correct listener is removed.

**Library used**

There is no specific library mentioned in the benchmark definition, but `document.getElementById` and `addEventListener` are part of the standard DOM API.

**Special JS feature or syntax**

The benchmark uses `const` declarations for variable scope, which was introduced in ECMAScript 2015 (ES6). This helps to avoid "variable hoisting" issues.

**Other considerations**

* The benchmark measures the execution time of adding and removing event listeners, which can be affected by factors like JavaScript engine optimizations, hardware performance, and network latency.
* To ensure accurate results, it's essential to run the benchmark multiple times and average the execution times.
* Users can experiment with different browsers, devices, or operating systems to see how the benchmark results vary.

**Alternatives**

If you want to create a similar benchmark, consider using:

1. A more advanced benchmarking library like Benchmark.js or Benchmarkr.
2. A testing framework like Jest or Mocha, which provides built-in support for benchmarking.
3. A custom implementation of event listener management, such as using a queue-based approach to reduce memory allocation and deallocation overhead.

Keep in mind that the specific details may vary depending on your requirements and goals.

Related benchmarks:

Cost of adding and removing events (version: 0)

Comparing performance of: Adding and removing event listeners vs Null

Created: one year ago by: Guest

Jump to the latest result

Adding and removing event listeners

Null

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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