Benchmark: getCasePermutations

Script Preparation code:

function getCasePermutations(S, idx, substr, result) {
	if (idx === S.length) {
		result.push(substr);
		return;
	}

	const char = S[idx];
	const nextIdx = idx + 1;

	if (char >= '0' && char <= '9') {
		getCasePermutations(S, nextIdx, substr + char, result);
		return;
	}
	getCasePermutations(S, nextIdx, substr + char.toLowerCase(), result);
	getCasePermutations(S, nextIdx, substr + char.toUpperCase(), result);

	return result;
}

function getCasePermutationsArr(S, idx, subStrArr, result) {
	if (idx === S.length) {
		result.push(subStrArr.join(''));
		return;
	}

	const char = S[idx];
	const nextIdx = idx + 1;

	if (char >= '0' && char <= '9') {
		subStrArr.push(char);
		getCasePermutationsArr(S, nextIdx, subStrArr, result);
		subStrArr.pop();
		return;
	}
	subStrArr.push(char.toLowerCase());
	getCasePermutationsArr(S, nextIdx, subStrArr, result);
	subStrArr.pop();

	subStrArr.push(char.toUpperCase());
	getCasePermutationsArr(S, nextIdx, subStrArr, result);
	subStrArr.pop();

	return result;
}

Tests:

Array version
getCasePermutationsArr('a1b2', 0, [], [])
String version
getCasePermutations('a1b2', 0, '', [])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array version
String version

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.

I'd be happy to help you understand what's being tested in this JavaScript microbenchmark.

**Benchmark Overview**

The provided benchmark measures the performance of two different approaches for generating permutations of a string: `getCasePermutations` (array version) and `getCasePermutations` (string version).

**Options Compared**

The benchmark compares two options:

1. **Array Version (`getCasePermutationsArr`)**: This approach uses an array to store the characters of the input string. It iterates over each character, adds it to the array, generates permutations recursively for each new element, and then removes the last added element from the array before backtracking.
2. **String Version (`getCasePermutations`)**: This approach concatenates the characters of the input string directly into a new string while generating permutations recursively.

**Pros and Cons**

Here are some pros and cons of each approach:

**Array Version (`getCasePermutationsArr`)**

Pros:

* May be more efficient for large strings, as it avoids creating multiple temporary strings.
* Can handle cases where the input string contains non-ASCII characters.

Cons:

* Uses an extra array to store the characters, which can lead to increased memory usage.
* Recursive function calls may cause stack overflows for very large inputs.

**String Version (`getCasePermutations`)**

Pros:

* Is simpler and more concise than the array version.
* Does not require extra memory for storing the input string's characters.

Cons:

* May be slower due to the repeated concatenation of strings, which can lead to increased CPU usage.
* Not suitable for non-ASCII character inputs.

**Library Usage**

The `getCasePermutationsArr` function uses a library called "JavaScript arrays" (i.e., built-in JavaScript arrays) to store and manipulate the input string's characters. The `String.prototype.toUpperCase()` and `String.prototype.toLowerCase()` methods are also used, which are part of the JavaScript standard library.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being used in this benchmark that's worth noting.

**Other Alternatives**

If you were to implement a different approach for generating permutations, some alternatives could include:

* Using a data structure like a trie or a suffix tree to store and traverse the input string.
* Employing a more efficient algorithm like the "bitap" algorithm, which is optimized for generating permutations of strings.

However, it's worth noting that the array version (`getCasePermutationsArr`) may be a suitable choice if you need to handle very large inputs or require low memory usage. The string version (`getCasePermutations`) is more straightforward but may not be as efficient.

Related benchmarks:

getCasePermutations (version: 0)

Comparing performance of: Array version vs String version

Created: 3 years ago by: Guest

Jump to the latest result

Array version

String version

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):