Get string, but not the same twice in a row

Questions & Answers
1

I want the player to enter a “password” when asked to in one of my minigames.
This password is selected from a string by using the following code:

	public string GetRandomPassWord(){
	    return Passwords[Random.Range(0, Passwords.Length)];
	}

This is of course working as intended.

Then, I want to check if the last selected password is the same as the new one, but that isn’t working correctly yet. What should I change in the following code to fix it?

			correctPassword = GetRandomPassWord();
			if (lastPass != "") {
				if(lastPass == correctPassword){
					correctPassword = GetRandomPassWord();
					Debug.Log ("Was last pass!");
				} else {
					lastPass = correctPassword;
				}
			} else {
				lastPass = correctPassword;
			}
2

Are you reusing the passwords or do they have single use?

If so, use a list and remove the entry once they are used. There are plenty on this on UA about unique random number.

If you plan on reusing them later on and you just don’t want two identical ones in a row, I would save the previous, find it from the list and create an array without it:

if(string.IsNullOrEmpty(previous) == true)
{
    // no problem you have no previous password
}
else
{
     List<string>pass = Passwords.ToList();
     pass.Remove(previous);
     string password = pass[Random.Range(0, pass.Count)];
     previous = password;
     // continue with identification using password
}
// here previous can be used outside the statement and contain the current password