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Jquery function performance
(version: 11)
Jquery event on.change() with anonymous function vs function
Comparing performance of:
Anonymous vs Declared
Created:
9 years ago
by:
Registered User
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HTML Preparation code:
<div id="test"></div> <input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" /><input data-form="checkbox" />
Script Preparation code:
function knownfunction() { var $this = $(this); $this.val('b'); }
Tests:
Anonymous
$('[data-form="checkbox"]').each(function() { var $this = $(this); $this.val('a'); });
Declared
$('[data-form="checkbox"]').each(knownfunction);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Anonymous
Declared
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Overview** The benchmark compares the performance of two approaches to execute an event handler for jQuery's `each()` method with a checkbox input field. **Approaches compared** 1. **Anonymous function**: The first approach uses an anonymous function (i.e., a function without a name) as the callback for the `each()` method. 2. **Declared function**: The second approach uses a named function (`knownfunction`) as the callback for the `each()` method. **Library and purpose** The benchmark relies on jQuery, which is a popular JavaScript library used for DOM manipulation and event handling. In this case, jQuery provides the `each()` method to iterate over elements that match a specified selector (in this case, `data-form="checkbox"`). **Test cases** There are two test cases: 1. **Anonymous**: This test case uses an anonymous function as the callback for the `each()` method. 2. **Declared**: This test case uses a named function (`knownfunction`) as the callback for the `each()` method. **Pros and cons of each approach** 1. **Anonymous function**: * Pros: Compact code, easy to read and maintain. * Cons: May be less readable or understandable by others who are not familiar with anonymous functions. 2. **Declared function**: * Pros: More readable and maintainable, easier to understand for others who are not familiar with anonymous functions. * Cons: Requires a named function to be defined before using it as the callback. **Other considerations** * Both approaches use jQuery's `each()` method, which is optimized for performance. * The benchmark uses Opera 42 browser version, which may have slightly different performance characteristics compared to other browsers. **Alternatives** If you were to write a similar benchmark, you could consider comparing other JavaScript frameworks or libraries that provide event handling and DOM manipulation capabilities. For example: 1. Vanilla JavaScript (without any library) 2. React 3. AngularJS 4. Vue.js However, keep in mind that these alternatives would likely have different performance characteristics and optimizations compared to jQuery. In summary, the benchmark compares the performance of using an anonymous function versus a declared function as the callback for jQuery's `each()` method with a checkbox input field. The results can help developers understand the trade-offs between readability, maintainability, and performance when writing JavaScript code.
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