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Add empty classes to classList
(version: 1)
Comparing performance of:
call add vs no call add
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var el = document.createElement('div') var classes = []
Tests:
call add
el.classList.add(...classes)
no call add
if (classes.length) { el.classList.add(...classes) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
call add
no call add
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 provided benchmark and explain what's being tested, compared, and discussed. **Benchmark Definition JSON** The provided benchmark definition is in JSON format: ```json { "Name": "Add empty classes to classList", "Description": null, "Script Preparation Code": "var el = document.createElement('div')\r\nvar classes = []", "Html Preparation Code": null } ``` This JSON defines a benchmark that measures the performance of adding an empty array of classes to the `classList` property of an HTML element. **Options Compared** There are two options being compared: 1. **Direct call**: The first test case, `"call add"`, directly calls the `classList.add()` method with the `classes` array as an argument. 2. **Indirect call**: The second test case, `"no call add"`, checks if the `classes.length` is greater than 0 before calling `classList.add()`. This is essentially a conditional statement that decides whether to perform the addition or not. **Pros and Cons of Each Approach** 1. **Direct Call**: * Pros: More straightforward and efficient, as it directly calls the method without any unnecessary checks. * Cons: May incur overhead due to the method call itself, even if no actual additions are made. 2. **Indirect Call**: * Pros: Can potentially save cycles by only performing the addition when necessary. * Cons: Introduces an additional check and potential branching, which may incur slight performance overhead. **Library Usage** In this benchmark, `classList` is a property of the HTML element's DOM interface. The `classList` property is implemented in Web Content Security Policy (CSP) Level 2, which allows it to be used for class manipulation. This means that all modern browsers support `classList`, making this benchmark more representative of real-world usage. **Special JS Features or Syntax** There are no special JavaScript features or syntax mentioned in the provided benchmark definition. The focus is on measuring the performance of a simple method call and conditional statement. **Alternatives** If you want to create similar benchmarks, you can consider adding more test cases to cover other scenarios, such as: * Measuring the performance of `classList` with an empty array. * Comparing the performance of different browser versions or platforms. * Adding additional class manipulation operations (e.g., removing classes). * Using other methods for class manipulation (e.g., `style.display`). For creating new benchmarks, you can consider using online tools like Benchmark.js, which provides a more structured and flexible way to create and run benchmarks.
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