JavaScript: How do I find all possible letter combinations of given letters though ..

[Wesso]

I would like to have a javascript that calculates all possible letter combinations of given letters with number of characters in the output.

However, not the same letter from the given letters more than once, except it is in the given word more than once.

For example:
- Named letters "ABCDE"
- Output letters are 4
- Results could be OKAY: "CBED", "ACED", "DEAB", "BCDE" etc
- But NOT OKAY: "AABC" or "BCCC"

However, if
- Named letters "ABCCD"
- Output letters are 4
- Results could be OKAY: "CBEC", "ACCD", "DABC", "ABCC" etc
- But NOT OKAY (more than 2 C's, as it is in the given word): "AABC" or "BCCC"

[Dormilich]

the number of possibilities is given by Permutation.

for the implementation I’d use an array and lots of loops.

note however, that the number of your results get soon very big (5 out of 10 is already > 30,000; 10 out of 20 is > 670,000,000,000).

[Wesso]

Thanks Dormilich for your reply