Looking to generate all possible combinations of elements (without repetition) from a given array and length.
For example, with an array of:
arr = ['a','b','c','d']
and a length of 3, the desired output would be a 2-dimensional array like this:
result = [
['a','b','c'],
['b','c','a'],
['c','a','b'],
. . . etc.
]
This task has proven quite challenging for me so far.
The code snippet below employs a straightforward method, generating permutations and combinations of the specified length. To prevent duplicates in the output, the permutations are compared against a dictionary.
function createPermutations(inputData, length) {
var currentSet = new Array(length), usedElements = new Array(length),
seenPerms = {}, finalResult = [];
function permute(index) {
if (index == length) {
if (!seenPerms[currentSet]) {
seenPerms[currentSet] = true;
finalResult.push(currentSet.slice());
}
return;
}
for (var j = 0; j < inputData.length; ++j) {
if (!usedElements[j]) {
usedElements[j] = true;
currentSet[index] = inputData[j];
permute(index + 1);
usedElements[j] = false;
}
}
}
permute(0);
return finalResult;
}
var resultPermutations = createPermutations(['a', 'a', 'b', 'b'], 3);
for (var k = 0; k < resultPermutations.length; ++k) {
document.write('[' + resultPermutations[k].join(', ') + ']<br />');
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