Benchmark: jQuery event On Performance

HTML Preparation code:

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<style>
  #container { visibility: hidden; }
</style>

<div id="container">
</div>

Script Preparation code:

var container = $('#container')
var itemCount = 300;

for (var i = 0; i < itemCount; i++) {
  container.append('<div>Item ' + i + '</div>');
}

var items = container.children();

Tests:

.each loop and multiple on-assignenements
items.each(function(index,item) { var $item = $(item); $item.on('click', function() { console.log('Item clicked'); }); $item.on('hover', function() { console.log('Item hovered'); }); $item.on('mouseenter', function() { console.log('Item mouseentered'); }); }); items.each(function(index,item) { var $item = $(item); $item.off('click'); $item.off('hover'); $item.off('mouseenter'); });
.each loop and single on-assignement
items.each(function(index,item) { var $item = $(item); $item.on('click', function() { console.log('Item clicked'); }); }); items.each(function(index,item) { var $item = $(item); $item.off('click'); });
no loop and .on-assignement on list
items.on('click', function() { console.log('Item clicked'); }); items.off('click');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
.each loop and multiple on-assignenements
.each loop and single on-assignement
no loop and .on-assignement on list

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Overview**

MeasureThat.net is a website where users can create and run JavaScript microbenchmarks to compare the performance of different approaches. The provided JSON benchmark definition represents a test case that measures the performance of event listeners on an HTML list.

**Benchmark Definition**

The benchmark definition consists of two parts:

1. **Script Preparation Code**: This code initializes the testing environment by:
	* Creating a container element with 300 child elements (div tags).
	* Appending a script tag to include jQuery.
	* Defining a style rule to hide the container element.
2. **Html Preparation Code**: This code includes the necessary HTML elements, including a container div and a script tag to load jQuery.

**Individual Test Cases**

There are three test cases:

1. **.each loop and multiple on-assignments**:
This test case creates an event listener for each item in the list using the `.each` method. It then sets up multiple events (click, hover, and mouseenter) for each item.
2. **.each loop and single on-assignment**:
Similar to the previous test case, but only sets up a single event (click) for each item.
3. **No loop and .on-assignments on list**:
This test case creates an event listener directly on the list element using the `.on` method without iterating over it with `.each`. It then removes the event listener.

**Pros and Cons**

Here's a brief overview of the pros and cons for each approach:

1. **.each loop and multiple on-assignments**:
	* Pros: Allows for easy setup of multiple events for each item, making it easier to test complex scenarios.
	* Cons: May lead to slower performance due to the overhead of iterating over the list.
2. **.each loop and single on-assignment**:
	* Pros: Still allows for efficient event handling without the overhead of iterating over the list.
	* Cons: May be less flexible than the previous approach, as it only sets up a single event.
3. **No loop and .on-assignments on list**:
	* Pros: Can lead to faster performance due to direct access to the list element, eliminating iteration overhead.
	* Cons: May not cover all edge cases or scenarios that rely on iterating over the list.

**Library and Purpose**

The provided benchmark uses jQuery as a library. jQuery is a popular JavaScript library that simplifies DOM manipulation, event handling, and other common tasks.

In this specific benchmark, jQuery's `.each` method is used to iterate over the list elements, while its `.on` method is used to attach events to individual elements or the entire element list.

**Special JS Features**

There are no special JavaScript features mentioned in the provided benchmark definition.

**Alternatives**

Other alternatives for event handling and iteration include:

* Vanilla JavaScript methods (e.g., `forEach`, `map`, `filter`) instead of jQuery's `.each`
* Other libraries like Lodash or Ramda, which provide utility functions for working with arrays and objects
* Directly accessing the DOM elements using property accessors (e.g., `element.addEventListener`)

Keep in mind that these alternatives may have different performance characteristics or trade-offs compared to the approaches used in the benchmark.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser/OS: Firefox 63 on Linux

View result in a separate tab

Test name	Executions per second
.each loop and multiple on-assignenements	126.9 Ops/sec
.each loop and single on-assignement	345.0 Ops/sec
no loop and .on-assignement on list	361.5 Ops/sec

Related benchmarks:

jQuery event On Performance (version: 0)

Comparing performance of: .each loop and multiple on-assignenements vs .each loop and single on-assignement vs no loop and .on-assignement on list

Created: 7 years ago by: Registered User

Jump to the latest result

.each loop and multiple on-assignenements

.each loop and single on-assignement

no loop and .on-assignement on list

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):