Benchmark: Math.round() - MeasureThat.net

Script Preparation code:

var a = 1234;
var b = 77

Tests:

Math.round
Math.round(a/b * 10)/10
ToFixed()
(a/b).toFixed(1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.round
ToFixed()

Fastest: N/A

Slowest: N/A

Latest 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 benchmark definition and test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that tests two methods: `Math.round()` and `toFixed()`. The goal is to compare the performance of these two functions for rounding a decimal value.

Here's what options are compared:

1. **`Math.round(a/b * 10)/10`**: This option multiplies the input number by 10, divides it by the result of another division (`a/b`), and then rounds the intermediate result to 1 decimal place using `toFixed(1)`. The final rounded value is obtained by dividing by 10 again.
2. **`(a/b).toFixed(1)`**: This option simply uses `toFixed(1)` on the direct result of dividing `a` by `b`.

**Pros and Cons**

Both approaches have their trade-offs:

**`Math.round(a/b * 10)/10`**:
Pros:

* Reduces precision issues: By multiplying by 10 and then dividing by 10, this approach minimizes potential rounding errors that might occur when dealing with very large or small numbers.
Cons:

* Increased computation: This approach requires more arithmetic operations compared to using `toFixed(1)` directly.

**`(a/b).toFixed(1)`**:
Pros:

* Simpler and faster: Using `toFixed(1)` directly is a straightforward approach that doesn't involve additional multiplication and division steps.
Cons:

* Potential precision issues: When dealing with very large or small numbers, this approach might introduce rounding errors due to the limited precision of `toFixed()`.

**Library and Special Features**

In neither of these test cases does the benchmark use a specific JavaScript library. However, it's worth noting that using `Math.round()` or `toFixed()` in various contexts might be influenced by other factors, such as:

* The browser's implementation of these functions
* The platform's floating-point arithmetic capabilities
* Specific use case requirements (e.g., financial calculations)

**Other Alternatives**

If the benchmark were to test alternative rounding methods, some possible approaches could include:

1. **Decimal.js**: A JavaScript library specifically designed for decimal arithmetic.
2. **Big.js**: Another library focused on large numbers and precise arithmetic.
3. **Built-in rounding functions in other programming languages**: For example, Python's `round()` or Java's `Math.round()`.
4. **Custom implementation using bit manipulation**: This approach would involve using bitwise operations to perform rounding.

Keep in mind that these alternative approaches might have different trade-offs in terms of performance, precision, and complexity.

I hope this explanation helps you understand the benchmark definition and test cases!

Related benchmarks:

Math.round() (version: 0)

Math.round() vs toFixed()

Comparing performance of: Math.round vs ToFixed()

Created: 4 years ago by: Guest

Jump to the latest result

Math.round

ToFixed()

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):