Run results for: getCasePermutationsMore

Run details:

User agent: Mozilla/5.0 (Linux; Android 13) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 113

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Array version	716.9 Ops/sec
String version	1292.5 Ops/sec

Script Preparation code:

function getCasePermutationsString(S) {
  let result = [];
  getCasePermutationsStringRecursive(S, 0, '', result);
  return result;
}

function getCasePermutationsStringRecursive(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') {
		getCasePermutationsStringRecursive(S, nextIdx, substr + char, result);
		return;
	}
	getCasePermutationsStringRecursive(S, nextIdx, substr + char.toLowerCase(), result);
	getCasePermutationsStringRecursive(S, nextIdx, substr + char.toUpperCase(), result);

	return result;
}

function getCasePermutationsArr(S) {
  let result = [];
  let subStrArray = Array(S.length);
  getCasePermutationsArrRecursive(S, 0, subStrArray, result);
  return result;
}

function getCasePermutationsArrRecursive(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[idx] = char;
		getCasePermutationsArrRecursive(S, nextIdx, subStrArr, result);
		return;
	}
	subStrArr[idx] = char.toLowerCase();
	getCasePermutationsArrRecursive(S, nextIdx, subStrArr, result);
	
	subStrArr[idx] = char.toUpperCase();
	getCasePermutationsArrRecursive(S, nextIdx, subStrArr, result);
}

Tests:

Array version
getCasePermutationsArr("a1b2c3d4e5f6g7h8i9j0")
String version
getCasePermutationsString("a1b2c3d4e5f6g7h8i9j0")

Run results for: getCasePermutationsMore

Array version

String version