get all combinations for a string

Question

I\'m trying to create a function in JavaScript that given a string will return an array of all possible combinations of the letters with each used at most once, starting wit

Answer 1

The accepted solution as of July 29, 2019 allows for duplicate strings to be returned in the array. The following adjustment fixes that little issue by adding a condition to the push.

            // however, we don't want duplicates so...
            if (!result.includes(next)) {
                result.push(next);    
            }