Benchmark: IP to number performance

Script Preparation code:

function ip2num1(ip){
	var octets = ip.split('.').map(o=>+o);
	return (octets[3]) | (octets[2]<<8) | (octets[1]<<16) | (octets[0] << 24);
}

function ip2num2(ip){
	var octets = ip.split('.').map(o=>+o).reverse();
	var num = 0; var o;
	while(o = octets.pop()){
		num *= 256;
		num += o;
	}
	return num;
}

var testIps = Array(1000).fill(0).map(()=>Array(4).fill(0).map(n=>Math.floor(Math.random()*256).toString()).join('.'))

Tests:

Function 1
var result1 = testIps.map(ip2num1);
Function 2
var result1 = testIps.map(ip2num2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Function 1
Function 2

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON.

**Benchmark Definition**

The benchmark is designed to measure the performance of two functions, `ip2num1` and `ip2num2`, which convert an IP address to a numerical value. The IP addresses are generated randomly and stored in an array called `testIps`.

**Options compared**

Two options are being compared:

1. **`ip2num1`**: This function takes the last octet of the IP address, shifts it 8 bits to the left, adds the second octet shifted 16 bits to the left, adds the third octet shifted 24 bits to the left, and finally adds the first octet.
2. **`ip2num2`**: This function splits the IP address into individual octets, reverses the order, and then multiplies each octet by 256 (to shift it to its correct position) before summing them up.

**Pros and Cons**

* **`ip2num1`**:
	+ Pros: Simple and straightforward implementation.
	+ Cons: May not be as efficient due to the manual shifting and addition operations.
* **`ip2num2`**:
	+ Pros: More efficient, as it uses a loop to process each octet in the correct order.
	+ Cons: More complex implementation with a reversal of the octets.

**Library usage**

Neither `ip2num1` nor `ip2num2` appears to use any libraries. The implementations are pure JavaScript functions.

**Special JS features or syntax**

There's no specific use of special JavaScript features or syntax in these implementations. However, it's worth noting that the use of the `map()` method for processing the IP addresses is a common pattern in modern JavaScript.

**Other alternatives**

If you were to reimplement this benchmark, you might consider alternative approaches, such as:

* Using bitwise operations with the `&` operator (e.g., `(octets[3]) & 255`) and shift operators to perform the conversion more efficiently.
* Using a library like `ip-to-number` or `uint8Array` for a more concise implementation.
* Adding additional benchmarks to compare performance under different conditions, such as with large or small IP addresses.

Keep in mind that the choice of implementation will depend on your specific use case and requirements.

Related benchmarks:

IP to number performance (version: 0)

Comparing performance of: Function 1 vs Function 2

Created: 9 years ago by: Guest

Jump to the latest result

Function 1

Function 2

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):