First challenge step 3 asks: Override the Scan method to return true if any value in the array is a repeat of the value

First, you need two == signs to compare.

You might be getting an IndexOutOfRange Exception with your current code. You need to check the entire sequence but you have to stop checking at the last index - 1.

Here's what you're missing:

namespace Treehouse.CodeChallenges
{
    class RepeatDetector : SequenceDetector
    {
        public override bool Scan(int[] sequence)
        {  
              for(int i=1; i < sequence.Length ; i++)
              { 
                   if(sequence[i] == sequence[i - 1])
                   {
                        return true;
                   }
              }
              return false;
        }
   }
}

Question for TJ Grist or anyone else that can provide some insight: For your "return false" statement on the outside of the for loop, wouldn't "false" be returned even if "true" was returned in the for loop? The reason I'm asking is because the exercise description mentions returning "true" if any value in the array is a repeat of the value. Thanks.

@Melodie Joseph you start from the second element of the array, and then compare it with the first one Remember, i = 1 is the second element, the first one is 0

Thank you @TJ Grist but for me, it hasn't worked. Compiler says about a problem with int and bool. Here is my solution.

namespace Treehouse.CodeChallenges
{    
class RepeatDetector : SequenceDetector
{
    public override bool Scan(int[] sequence)
    {
        bool isSame = false;
        for(int i = 1 ; i < sequence.Length; i++)
        {         
            if(sequence[i] == sequence[i-1]) 
            {
              isSame=true;
              return isSame;
            }            
        }   
        return isSame;
    }         

}
}