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>

​x
 
<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();

 
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'); });
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'); });
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');
items.on('click', function() { console.log('Item clicked'); });

items.off('click');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

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

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

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

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:

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.
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:

.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.
.each loop and single on-assignment: Similar to the previous test case, but only sets up a single event (click) for each item.
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:

.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.
.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.
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.

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Overview**

**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.

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 7 months ago):