Benchmark: Test To fixed vs regex

Tests:

Regex
var x = 12.030303; x.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0];
toFixed
var x = 12.030303; x.toFixed(2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
toFixed

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36

Browser/OS: Chrome 99 on Windows

View result in a separate tab

Test name	Executions per second
Regex	13440631.0 Ops/sec
toFixed	5468258.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is comparing two approaches to formatting a fixed-point number: using regular expressions (`Regex`) versus the `toFixed()` method.

**Options Compared**

There are two options being compared:

1. **Regex**: Using regular expressions to extract the integer part from a floating-point number. In this case, the pattern `/^-?\\d+(?:\\.\\d{0,2})?/` is used to match the desired format.
2. **toFixed()**: Using the `toFixed()` method to explicitly format the number with two decimal places.

**Pros and Cons of Each Approach**

1. **Regex**:
	* Pros: Can be flexible and powerful for complex formatting tasks.
	* Cons: May have a higher overhead due to the complexity of regular expressions, which can lead to slower performance.
	* Additional considerations: Regular expressions can be prone to errors if not used correctly, and may not handle all edge cases.
2. **toFixed()**:
	* Pros: Generally faster and more efficient than using regex, as it's a built-in method optimized for this specific task.
	* Cons: May not provide the same level of flexibility as regex, limiting its use to simple formatting tasks.

**Library Usage**

There is no explicit library usage in the benchmark definitions. However, it's worth noting that `toFixed()` is a standard JavaScript method provided by most browsers, whereas regular expressions may require additional libraries or configuration.

**Special JavaScript Features/Syntax**

This benchmark does not explicitly use any special JavaScript features or syntax, such as async/await, Promises, or modern JavaScript features like arrow functions. The focus is on the simple formatting task at hand.

**Other Alternatives**

If you're looking for alternatives to this approach, consider:

1. Using a dedicated library like `lodash` or `moment.js` for complex formatting tasks.
2. Utilizing browser-specific APIs, such as `Number.prototype.toExponential()` or `Number.prototype.toPrecision()`, which may provide faster performance for certain use cases.

**Benchmark Preparation Code**

The benchmark preparation code is minimal, as it only includes the JavaScript code being tested:
```javascript
var x = 12.030303;
x.toString().match(/^-?\\d+(?:\\.\\d{0,2})?/)[0];
```
or
```javascript
var x = 12.030303;
x.toFixed(2);
```

**Latest Benchmark Result**

The latest benchmark results show the performance of each approach:

| Test Name | ExecutionsPerSecond |
| --- | --- |
| Regex | 13440631.0 |
| toFixed | 5468258.5 |

In this case, the `Regex` approach is significantly faster than the `toFixed()` method.

Related benchmarks:

Test To fixed vs regex (version: 0)

Comparing performance of: Regex vs toFixed

Created: 3 years ago by: Guest

Jump to the latest result

Regex

toFixed

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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