Benchmark: percentChange - MeasureThat.net

HTML Preparation code:

<script src="//cdnjs.cloudflare.com/ajax/libs/numeral.js/2.0.6/numeral.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/accounting.js/0.1/accounting.min.js"></script>

Tests:

Numeral js
let a = 121230.4252; numeral(a).format('0,0.00')+'%';
Regex
let a = 121230.4252; a.toFixed(2).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")+"%"
Math.floor
let a = 121230.4252; (~~(a * 100) / 100).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")+"%";
parseFloat
let a =121230.4252; Number.parseFloat(a).toFixed(2).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")+"%";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Numeral js
Regex
Math.floor
parseFloat

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark tests different ways to format a number representing a percentage change.  The input is `121230.4252`, and the goal is to produce a string like "121,230.43%".

Let's break down each approach:

* **Numeral.js:** This uses the popular Numeral.js library for number formatting. It provides an easy way to format numbers with specific patterns and locales.
    * **Pros:**  Readability, flexibility (numeral.js can handle various formats and currency options).
    * **Cons:** Adds a dependency to your project.

* **Regex:** This approach uses regular expressions to insert commas as thousands separators. 
    * **Pros:** Can be very concise if you're familiar with regex.
    * **Cons:** Regular expressions can be complex to read and debug, especially for beginners.

* **Math.floor:** This method involves multiplying the number by 100, using `Math.floor` to round it down, then dividing by 100 again to get the percentage. Finally, it applies the comma separator.
    * **Pros:**  Pure JavaScript, no external libraries needed.
    * **Cons:** Can be slightly less performant compared to optimized libraries like Numeral.js.

* **parseFloat:** This uses `parseFloat` to ensure we're working with a floating-point number and then applies the same formatting as in the Regex approach. 
    * **Pros:**  Similar to Math.floor, it's pure JavaScript.
    * **Cons:** Slightly less performant compared to the other methods.

**Other Alternatives:**

* **Lodash/Underscore:** These libraries have dedicated functions for number formatting that might be more readable and efficient than using raw JavaScript or regex.
* **Moment.js:** While primarily used for date/time manipulation, Moment.js also offers formatting options for numbers.

**Important Notes:**

* The performance results will vary depending on your browser, hardware, and other factors.
* This benchmark focuses on pure formatting speed. Real-world applications might involve additional logic or data handling that could affect overall performance.

Related benchmarks:

percentChange (version: 5)

Percent Change values formatter

Comparing performance of: Numeral js vs Regex vs Math.floor vs parseFloat

Created: 5 years ago by: Registered User

Jump to the latest result

Numeral js

Regex

Math.floor

parseFloat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):