Benchmark: toFixed vs Math.round() with numbers222

Script Preparation code:

var someFloat = 18.99;

Tests:

Number(toFixed())
Number((someFloat * 100).toFixed());
Math.round(someFloat*100);
Math.round(someFloat*100);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number(toFixed())
Math.round(someFloat*100);

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON data to understand what is being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. `Number((someFloat * 100).toFixed());` - This line uses the `toFixed()` method on a number variable (`someFloat`) multiplied by 100.
2. `Math.round(someFloat*100);` - This line uses the `round()` function from the Math library to round a number (`someFloat`) multiplied by 100.

**Options Compared**

These two test cases compare two different approaches for rounding numbers:

1. **Using `toFixed()`**: This method returns a string representation of the number with the specified number of decimal places.
2. **Using `Math.round()`**: This function rounds a number to the nearest integer, either up or down.

**Pros and Cons**

* Using `toFixed()`: Pros:
	+ Returns a string representation of the number, which can be useful for formatting purposes.
	+ Can be more readable in certain contexts (e.g., logging).
Cons:
	+ May lead to unexpected behavior if the input is not a number or if the decimal places are not correctly specified.
* Using `Math.round()`: Pros:
	+ Fast and efficient.
	+ Consistent rounding behavior, even for non-integer inputs.
Cons:
	+ Returns an integer value, which may lose precision.

**Library and Purpose**

In this benchmark, neither library is explicitly used. However, the `toFixed()` method is a built-in JavaScript method that doesn't rely on any external libraries.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in the provided code snippets.

**Alternatives**

Other alternatives for rounding numbers in JavaScript include:

1. `Number.prototype.toFixed()`: This method is similar to the standalone `toFixed()` function but applies it to a number.
2. `Decimal.js` library: This library provides decimal arithmetic and rounding functions, which can be more precise than built-in methods.

In summary, this benchmark compares two approaches for rounding numbers in JavaScript: using the `toFixed()` method versus the `Math.round()` function. The results will indicate which approach is faster and more efficient on a specific device and browser configuration.

Related benchmarks:

toFixed vs Math.round() with numbers222 (version: 0)

Comparing performance of: Number(toFixed()) vs Math.round(someFloat*100);

Created: 3 years ago by: Guest

Jump to the latest result

Number(toFixed())

Math.round(someFloat*100);

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):