/// <summary>Returns a tuple with only the first (or last) items of this tuple</summary>
/// <param name="tuple">Tuple to truncate</param>
/// <param name="count">Number of items to keep. If positive, items will be taken from the start of the tuple. If negative, items will be taken from the end of the tuple</param>
/// <returns>New tuple of size |<paramref name="count"/>|.</returns>
/// <example>
/// (a, b, c).Truncate(2) => (a, b)
/// (a, b, c).Truncate(-2) => (b, c)
/// </example>
public static IFdbTuple Truncate([NotNull] this IFdbTuple tuple, int count)
{
tuple.OfSizeAtLeast(Math.Abs(count));
if (count < 0)
{
int offset = tuple.Count + count;
return(Substring(tuple, offset, -count));
}
else
{
return(Substring(tuple, 0, count));
}
}
