/// <summary>
/// Returns a copy of a frame based on its index. If the index is not valid, the method returns NULL.
/// The return value is a copy of the original object to ensure it is immutable.
/// </summary>
public BowlingFrame GetFrame(int index)
{
// Check if the given index is valid. If yes - return a copy of BowlingFrame, otherwise, return NULL.
return((BowlingGameExtenstions.IsIndexExists(Frames, index)) ?
new BowlingFrame(BowlingGameExtenstions.GetItemFromArray <BowlingFrame>(Frames, index)) :
null);
}
/// <summary>
/// Returns the frame type, based on the requested index. If the requested index is invalid, the return value is Empty.
/// This method is more efficient than calling GetFrame, as it avoids creation of a new BowlingFrame instance.
/// </summary>
public FrameTypeEnum GetFrameType(int index)
{
return(BowlingGameExtenstions.GetItemFromArray <BowlingFrame>(Frames, index)?.FrameType ?? FrameTypeEnum.Empty);
/// This is the inefficient way to return the frame's type.
//return (GetFrame(BowlingGameExtenstions.NUM_OF_REGULAR_ROUNDS - 1)?.FrameType) ?? FrameTypeEnum.Empty;
}
/// <summary>
/// Returns the score of a given frame if exists, otherwise return null.
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public int?GetFrameScore(int index)
{
return(BowlingGameExtenstions.GetItemFromArray <int?>(GetFramesScores(), index));
}