Benchmark: toFixed vs Math.round -> string

Script Preparation code:

var someFloat = 77.123456789;

Tests:

toFixed
`${someFloat.toFixed(0)}`;
Math.round
`${Math.round(someFloat)}`;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toFixed
Math.round

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Safari/605.1.15

Browser/OS: Safari 26 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
toFixed	15305745.0 Ops/sec
Math.round	75098552.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 6 months ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the JSON focuses on comparing two methods for converting a floating-point number to a string representation: `toFixed` and `Math.round`. Both methods are implemented on a variable called `someFloat` which holds the value `77.123456789`.

### Test Cases Comparison

1. **toFixed**:
   - **Benchmark Definition**: `` `${someFloat.toFixed(0)}` ``
   - **Functionality**: The `toFixed` method formats a number using fixed-point notation. Specifically, `toFixed(0)` rounds the number to the nearest integer and returns it as a string. For `someFloat`, this yields `'77'`.
   - **Pros**: 
     - Can specify the number of digits after the decimal point, making it versatile for various formatting needs.
     - Always returns a string, which might be convenient in certain contexts.
   - **Cons**: 
     - Performance might be slower than simple rounding because it performs additional formatting operations.
     - May introduce quirks due to floating-point arithmetic in some edge cases.

2. **Math.round**:
   - **Benchmark Definition**: `` `${Math.round(someFloat)}` ``
   - **Functionality**: The `Math.round` function rounds a number to the nearest integer and returns it as a number. When wrapped in a template literal to create a string, it also results in `'77'`.
   - **Pros**: 
     - Generally faster than `toFixed`, as it simply rounds the number without any additional formatting.
     - Straightforward in usage, particularly when you're only concerned with rounding to the nearest integer.
   - **Cons**: 
     - Returns a number, which may require conversion to a string if such formatting is needed.

### Benchmark Results Analysis

Based on the latest benchmark results from a specific environment:

- **Math.round**:
  - **Executions Per Second**: 75,098,552
  - Performance is significantly superior, indicating that in this specific case and environment, rounding is more efficient.
  
- **toFixed**:
  - **Executions Per Second**: 15,305,745
  - A notable drop in performance compared to `Math.round`, highlighting the added complexity of formatting operations.

### Other Considerations and Alternatives

#### Considerations:
- **Accuracy**: The differences in performance might vary across different browsers and environments, so benchmarking in production-like conditions is essential.
- **Readability**: While performance is crucial, the readability of code is equally important. Depending on the context, one method may be more appropriate than the other.

#### Alternatives:
1. **Custom Rounding Functions**: Developers might implement their own rounding logic, though this can lead to increased complexity and potential bugs.
2. **Using Libraries**: Libraries like `lodash` or `math.js` provide extensive numerical utilities, including rounding methods, but this often comes at the cost of added bundle size due to increased dependency.
3. **Other Number Formatting Functions**: JavaScript also offers other options for formatting numbers, such as `Intl.NumberFormat`, which provides extensive localization capabilities but may be less performant than the direct methods tested.

Overall, while `Math.round` is faster for this particular use case, it's important to choose the method that best fits the context and requirements of your application analysis.

Related benchmarks:

toFixed vs Math.round -> string (version: 1)

toFixed vs Math.round when both are eventually embedded into a string.

Comparing performance of: toFixed vs Math.round

Created: 6 months ago by: Guest

Jump to the latest result

toFixed

Math.round

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 6 months ago):