Benchmark: style.borderLeftWidth and style.marginLeft

HTML Preparation code:

<div id="test"></div>

Script Preparation code:

var el = document.getElementById("test");
var style = window.getComputedStyle(el);

function ConvertCssToInt2(x, defaultValue) {
  return (isNaN(x) ? defaultValue : x);
};

Tests:

style.borderLeftWidth
var t = ConvertCssToInt2(parseInt(style.borderLeftWidth, 10), 0);
style.marginLeft
var t = ConvertCssToInt2(parseInt(style.marginLeft, 10), 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
style.borderLeftWidth
style.marginLeft

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark JSON and explain what's being tested.

**Benchmark Definition**

The test is designed to measure the performance of two CSS properties: `borderLeftWidth` and `marginLeft`. These properties are used to set the width of a border on the left side of an element and its left margin, respectively.

**Options Compared**

The benchmark compares the performance of three options:

1. **Browser's built-in parsing**: The browser's JavaScript engine parses the CSS values using its own implementation.
2. **`parseInt()` with radix 10**: This option uses the `parseInt()` function to parse the CSS value as an integer, specifying a radix of 10 (base 10).
3. **Custom parsing function**: A custom function `ConvertCssToInt2()` is used to parse the CSS values. This function takes two arguments: the CSS value and a default value.

**Pros and Cons**

1. **Browser's built-in parsing**: Pros:
	* Fast and efficient, as it leverages the browser's optimized implementation.
	* Less code to write and maintain.
Cons:
	* May not be highly configurable or customizable.
2. **`parseInt()` with radix 10**: Pros:
	* Highly configurable and customizable, as the radix can be changed.
	* Easy to implement in other JavaScript environments.
Cons:
	* May be slower than the browser's built-in parsing due to the overhead of `parseInt()`.
3. **Custom parsing function**: Pros:
	* Highly configurable and customizable.
	* Can be optimized for specific use cases or performance profiles.
Cons:
	* Requires more code and maintenance compared to the other options.

**Library Usage**

In this benchmark, no external libraries are used. The custom parsing function `ConvertCssToInt2()` is a simple implementation written by the test creator.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that the use of `parseInt()` and a custom parsing function may be considered advanced or niche topics in some programming contexts.

**Other Alternatives**

To measure performance differences between these options, you could consider using other approaches:

1. **Using `Number.parseInt()`**: This is a modern JavaScript method to parse numeric strings, which might offer better performance than the `parseInt()` function.
2. **Using a library like Lodash or Moment.js**: These libraries provide utility functions for parsing dates and numbers, which could be adapted for CSS parsing purposes.
3. **Using a specialized library for CSS parsing**: There are libraries available that specialize in parsing CSS rules, such as the `css-parse` library.

These alternatives might offer different trade-offs in terms of performance, ease of use, and maintainability, but they can provide more flexibility or specific features not covered by the original benchmark.

Related benchmarks:

style.borderLeftWidth and style.marginLeft (version: 2)

Comparing performance of: style.borderLeftWidth vs style.marginLeft

Created: 9 years ago by: Registered User

Jump to the latest result

style.borderLeftWidth

style.marginLeft

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):