Benchmark: meow meow meow meow

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Tests:

Round floating number using lodash round function
for (var i = 0; i < 10; i = i + 0.01) { _.round(i, 2); }
Round floating number using toFixed()
const b = 2; for (var i = 0; i < 10; i = i + 0.01) { const meow = b * 10; Math.round(i * meow) / meow }
tofixed
const b = 2; for (var i = 0; i < 10; i = i + 0.01) { parseFloat(i.toFixed(b)) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Round floating number using lodash round function
Round floating number using toFixed()
tofixed

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
Round floating number using lodash round function	1922.9 Ops/sec
Round floating number using toFixed()	314393.6 Ops/sec
tofixed	6166.4 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 10 days ago):

LLMs can make mistakes. Check important info.

The benchmark defined by the JSON compares the performance of three different methods for rounding floating-point numbers in JavaScript:

1. **Using Lodash's `_.round` function**: 
   - **Test Definition**:
     ```javascript
     for (var i = 0; i < 10; i = i + 0.01) {
         _.round(i, 2);
     }
     ```
   - **Pros**: 
     - Lodash is a widely-used utility library that provides many helpful functions for data manipulation. The `_.round` function is easy to use and offers consistent behavior across various edge cases, such as dealing with negative numbers or large decimals.
   - **Cons**:
     - It requires the additional overhead of including the Lodash library in your project, which may not be necessary if you only need basic rounding. Additionally, being a library function, its performance might not match that of native functions.
   - **Performance**: This method achieved an execution speed of approximately 1922.88 executions per second on the benchmark.

2. **Using JavaScript's native `Math.round` function with a manual calculation**:
   - **Test Definition**:
     ```javascript
     const b = 2;
     for (var i = 0; i < 10; i = i + 0.01) {
         const meow = b * 10;
         Math.round(i * meow) / meow;
     }
     ```
   - **Pros**: 
     - This approach utilizes native JavaScript functions, which are typically optimized for performance. The `Math.round` function is a built-in method that likely has less overhead than a library call.
   - **Cons**:
     - Requires more manual calculations compared to the Lodash method. Also, careful consideration is necessary to handle edge cases correctly if the intent is to round to a specific number of decimal places.
   - **Performance**: This method exhibited significantly higher performance, recording about 6166.37 executions per second.

3. **Using the `toFixed()` method on numbers**:
   - **Test Definition**:
     ```javascript
     const b = 2;
     for (var i = 0; i < 10; i = i + 0.01) {
         parseFloat(i.toFixed(b));
     }
     ```
   - **Pros**: 
     - The `toFixed()` method is straightforward and directly expresses the intention of rounding to a certain number of decimal places. It returns a string, which can be easily parsed back to a float.
   - **Cons**:
     - The function returns a string representation of the rounded number, which incurs an additional parsing step (`parseFloat`) to convert it back to a number. This increases overhead and may affect performance.
   - **Performance**: This method had the best performance, with about 314393.56 executions per second, making it the fastest option in the benchmark.

### Overall Considerations:
- **Performance**: The `toFixed()` method is the fastest among the three methods, largely due to its optimization in the JavaScript engine for string handling and parsing. The native `Math.round` method is also faster than the Lodash approach, which adds extra overhead due to the function call.
- **Readability**: While `toFixed()` may not be the most computationally efficient due to post-processing, it is very clear and expressive for anyone reading the code. Conversely, the Lodash method is more readable for new developers familiar with Lodash.
- **Use Cases**: If performance is critical, especially in scenarios involving a high volume of floating-point calculations, `toFixed()` or `Math.round` should be preferred over Lodash. However, if ease of use and readability are the goals, especially for teams familiar with Lodash, using its functions could be justified despite performance trade-offs.

### Alternatives:
- **Custom Rounding Function**: Developers may also implement a custom rounding function that combines features of both native methods and Lodash, tailored specifically to their application's use case.
- **Other Libraries**: Besides Lodash, there are other libraries such as Underscore.js, which provides similar utilities but may vary in performance. Additionally, developers can explore performance libraries that offer optimized mathematical function implementations.

In conclusion, when choosing a method for rounding numbers in JavaScript, one must weigh between performance and code clarity, depending on the application's specific needs.

Related benchmarks:

meow meow meow meow (version: 1)

Compare round lodash function vs javascript native toFixed() function

Comparing performance of: Round floating number using lodash round function vs Round floating number using toFixed() vs tofixed

Created: 10 days ago by: Guest

Jump to the latest result

Round floating number using lodash round function

Round floating number using toFixed()

tofixed

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 10 days ago):