Benchmark: isInteger vs Regexp

Script Preparation code:

let arr = [];
const fin = Number((Math.random() * 10).toFixed())
for (let i = 0; i <= fin; i++) { arr.push(i); }

Tests:

Regexp
for (let i = 0; i <= 10; i++) { /^(?:[-+]?(?:0|[1-9]\d*))$/.test(i); }
isInteger
for (let i = 0; i <= 10; i++) { Number.isInteger(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regexp
isInteger

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0

Browser/OS: Chrome 139 on Windows

View result in a separate tab

Test name	Executions per second
Regexp	5368334.0 Ops/sec
isInteger	64111576.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its results.

**Benchmark Description**

The benchmark compares two approaches to test whether a number is an integer: using a regular expression (`Regexp`) versus using the `Number.isInteger()` function in JavaScript.

**Options Compared**

1. **Regular Expression (Regexp)**:
	* Pros:
		+ Can be used for more complex type checking.
		+ Often used for parsing and validation tasks.
	* Cons:
		+ Can be slower due to the overhead of regular expression compilation and execution.
		+ May have performance issues if not properly optimized.
2. **Number.isInteger()**:
	* Pros:
		+ Faster, as it's a built-in function specifically designed for this purpose.
		+ Often used in conjunction with other methods, making it a common choice.
	* Cons:
		+ Only works on numbers, not strings or other types.

**Other Considerations**

When choosing between these two approaches, consider the specific requirements of your use case:

* If you need to check if a value is an integer for parsing or validation purposes, `Regexp` might be a better choice.
* If you're working with numbers and performance is critical, `Number.isInteger()` is likely a better option.

**Library Used**

Neither of the two options relies on any external libraries. However, it's worth noting that modern JavaScript engines have built-in support for regular expressions, which can affect performance.

**Special JS Features or Syntax**

There are no special features or syntax used in these benchmark cases. The code is written in plain JavaScript.

**Alternative Approaches**

If you're looking for alternative approaches to test if a number is an integer, consider:

1. **ToNumber() and isNaN()**: `isNaN(Number(x))` can be used as an alternative to checking with `isInteger()` or Regexp.
2. **Type Checking**: Using type annotations (e.g., TypeScript) can help catch errors at compile-time rather than runtime.

Keep in mind that the performance of these alternatives might vary depending on your specific use case and JavaScript environment.

I hope this explanation helps you understand the benchmark and its results!

Related benchmarks:

isInteger vs Regexp (version: 0)

Comparing performance of: Regexp vs isInteger

Created: 7 years ago by: Guest

Jump to the latest result

Regexp

isInteger

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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