Benchmark: Object change vs change class

HTML Preparation code:

<div class="change" id="hasClass"></div>
<div class="" id="hasNoClass"></div>

Script Preparation code:

var object = {a: false, b: true};
var changeVar = false;
var changeVarCondition = true;
var hasClass = document.getElementById('hasClass').classList;
var hasNoClass = document.getElementById('hasNoClass').classList;

Tests:

Change object value
if (object.b == true) { object.a = true; }
Change Var Value
if (changeVarCondition == true) { changeVar = true; }
Change class with class
hasClass.remove('change');
Change class with no class
hasNoClass.remove('change');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Change object value
Change Var Value
Change class with class
Change class with no class

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!

**Benchmark Overview**

The provided JSON represents a benchmarking setup for measuring the performance differences between various approaches to modifying classes and variable values in JavaScript. The test cases focus on comparing the execution speed of different methods, including:

1. Direct property assignment (e.g., `object.b = true`)
2. Using a temporary variable (e.g., `var changeVar = false; changeVar = true;`)
3. Removing a class from an element using the `remove()` method (e.g., `hasClass.remove('change')`)

**Options Compared**

The benchmark compares the following options:

1. **Direct property assignment**: Modifying properties directly on the object.
2. **Using a temporary variable**: Assigning a value to a temporary variable and then assigning it to the desired property or element.
3. **Removing a class from an element using `remove()` method**: Removing a class from an HTML element using the `removeClass()` method.

**Pros and Cons**

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

1. **Direct Property Assignment**:
	* Pros: Fast, straightforward, and efficient.
	* Cons: May lead to unexpected side effects if not used carefully (e.g., modifying properties that should be read-only).
2. **Using a Temporary Variable**:
	* Pros: Can be useful when working with complex expressions or conditional statements.
	* Cons: May introduce additional overhead due to the creation and assignment of a temporary variable.
3. **Removing a Class from an Element using `remove()` method**:
	* Pros: Can be useful when working with DOM manipulation, as it allows for more control over class names and their application.
	* Cons: May be slower than direct property assignment or using a temporary variable, depending on the specific use case.

**Library and Special JS Features**

The benchmark does not explicitly mention any libraries or special JavaScript features. However, it's worth noting that the `remove()` method is supported by most modern browsers, including Safari, which is used in this benchmark.

**Other Alternatives**

If you're interested in exploring alternative approaches to modifying classes and variable values, consider the following options:

1. **Destructuring assignment**: Instead of using a temporary variable, you can use destructuring assignment to assign properties directly to variables.
2. **Arrow functions**: Arrow functions (e.g., `() => { object.b = true; }`) can be used for concise expressions, but may have performance implications due to their nature.
3. **Object mutation**: Some browsers and JavaScript engines have optimized object mutation (e.g., assigning properties directly) using a technique called "object property aliasing." However, this is not widely supported across all platforms.

When working with JavaScript benchmarks like this one, it's essential to consider the trade-offs between different approaches and the specific requirements of your use case.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 15 on iOS 15.4.1

View result in a separate tab

Test name	Executions per second
Change object value	8401783.0 Ops/sec
Change Var Value	7222314.0 Ops/sec
Change class with class	5889300.0 Ops/sec
Change class with no class	6163892.5 Ops/sec

Related benchmarks:

Object change vs change class (version: 0)

Comparing performance of: Change object value vs Change Var Value vs Change class with class vs Change class with no class

Created: 7 years ago by: Guest

Jump to the latest result

Change object value

Change Var Value

Change class with class

Change class with no class

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):