Random String from list of string without repeated letters

Question

  List letters = new List();
 
 //for exampe letters = e,n,d
 
 for (int i = 0; i < letters.Count; i++)
         {
             myString += letters[UnityEngine.Random.Range(0, letters.Count)];
 
             if (myString.Length != letters.Count)
             {
                 return;
             }
 
             if (!randomWords.Contains(myString))
             {
                 randomWords.Add(myString);
                 rwords.text = rwords.text + " " + myString;
             } 
 
             myString = "";
         }

And i get a random words but the letters repeat for example: eed, enn.
I want to get words from list of letters for example: end, edn, ned, nde, den, dne.
Or if letters are more.

Answer 1

Best Answer

Answer by sacredgeometry · Jan 23, 2020 at 09:01 PM

You could do what logicandchaos said or you could randomise the order of the list/string and take the first n (obviously where n is smaller or equal to the size of the list) from the newly randomised list/string. Bear in mind this doesnt protect against duplicate sequences it just means that there arent duplicate characters.

             var alphabet = "abcdefghijklmnopqrstuvwxyz";
             var num = new Random();
             var randomString = new string(
                 alphabet
                     .ToCharArray()
                     .OrderBy(s => (num.Next(2) % 2) == 0)
                     .Take(3)
                     .ToArray()
                 );

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Answer 2

Answer by logicandchaos · Jan 23, 2020 at 08:45 PM

Sure, just when you select the letter myString += letters[UnityEngine.Random.Range(0, letters.Count)]; you just need to check if the last letter is the same, but then if it's not you have to generate a new value, so it will need to be put in a loop.

 char newLetter = letters[UnityEngine.Random.Range(0, letters.Count)];
 while(newLetter == myString[myString.Length])
 newLetter = letters[UnityEngine.Random.Range(0, letters.Count)];
 myString += newLetter;

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Random String from list of string without repeated letters

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