Benchmark: toFixed vs toPrecision vs Round without Stringify v3

Script Preparation code:

var someFloat = 3.141592653589;

Tests:

someFloat.toPrecision(1)
someFloat.toPrecision(1);
Math.round(someFloat)
Math.round(someFloat);
someFloat.toFixed(0);
someFloat.toFixed(0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
someFloat.toPrecision(1)
Math.round(someFloat)
someFloat.toFixed(0);

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0

Browser/OS: Firefox 100 on Ubuntu

View result in a separate tab

Test name	Executions per second
someFloat.toPrecision(1)	20714548.0 Ops/sec
Math.round(someFloat)	1543128704.0 Ops/sec
someFloat.toFixed(0);	22904452.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its options.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that compares three different methods for rounding or formatting a floating-point number: `toFixed`, `toPrecision`, and `Math.round`. The test case uses a predefined float value, `someFloat = 3.141592653589;`.

**Options compared:**

1. **`someFloat.toPrecision(1)`**: This method formats the number to a specific precision (in this case, 1 decimal place). It returns a string representation of the number.
2. **`Math.round(someFloat)`**: This method rounds the number to the nearest integer using the `round()` function from the Math library. It also returns an integer value.
3. **`someFloat.toFixed(0)`**: This method formats the number as an integer by rounding down to the nearest whole number and padding with zeros if necessary.

**Pros and cons of each approach:**

*   **`toPrecision(1)`**:
    *   Pros:
        *   Returns a string representation, which can be useful for certain applications (e.g., displaying numbers in a specific format).
        *   Can be more accurate than `toFixed` or `Math.round` for certain use cases.
    *   Cons:
        *   May not be suitable for all applications (e.g., numerical computations) due to potential precision issues.
*   **`Math.round()`**:
    *   Pros:
        *   Fast and efficient, as it leverages the optimized `round()` function from the Math library.
        *   Suitable for numerical computations where accuracy is more important than string representation.
    *   Cons:
        *   Returns an integer value, which may not be desirable in all cases (e.g., when displaying decimal numbers).
*   **`toFixed(0)`**:
    *   Pros:
        *   Simple and straightforward approach that works well for most applications.
        *   Returns an integer value, which can simplify certain use cases.
    *   Cons:
        *   May not be suitable for all applications (e.g., when dealing with decimal numbers) due to rounding down.

**Library usage:**

The test case uses the `Math` library's `round()` function, which is a built-in JavaScript method for rounding numbers.

**Special JS features or syntax:**

There are no special JS features or syntax used in this benchmark. It only leverages standard JavaScript methods and operators.

**Alternative approaches:**

Other alternatives to consider when working with floating-point numbers include:

*   Using the `Number.EPSILON` constant to determine the smallest possible difference between two numbers, which can be useful for comparing floating-point values.
*   Implementing custom rounding algorithms or using specialized libraries (e.g., `decimal.js`) for more precise control over rounding and formatting operations.

Keep in mind that the specific approach chosen will depend on the requirements of your application and the trade-offs you're willing to make between precision, performance, and simplicity.

Related benchmarks:

toFixed vs toPrecision vs Round without Stringify v3 (version: 0)

Comparing performance of: someFloat.toPrecision(1) vs Math.round(someFloat) vs someFloat.toFixed(0);

Created: 2 years ago by: Guest

Jump to the latest result

someFloat.toPrecision(1)

Math.round(someFloat)

someFloat.toFixed(0);

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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