gistfile1.cs

private static void descriptiveImp()
        {
            var weatherData = File.ReadAllLines(@"C:\weather.dat");

            Func<string,DataPoint> ConvertLineToDataPoint = line => {
                                                                        var currLine = line.Trim().Split(new[] { '\t' }, StringSplitOptions.RemoveEmptyEntries);
                                                                        return new DataPoint
                                                                        {
                                                                           day = Int32.Parse(currLine[0]),
                                                                           max = Int32.Parse(currLine[1]),
                                                                           min = Int32.Parse(currLine[2])
                                                                        };
                                                                    };

            Func<DataPoint,Tuple<int,int>> ConvertDataPointToDaySpreadTuple = dp => new Tuple<int, int>(dp.day, dp.max - dp.min);

            Func<Tuple<int, int>, Tuple<int, int>, Tuple<int, int>> TupleWithSmallestSpread = (a, b) => a.Item2 < b.Item2 ? a : b;

            var minSpread = weatherData.Select(ConvertLineToDataPoint)
                                       .Select(ConvertDataPointToDaySpreadTuple)
                                       .Aggregate(TupleWithSmallestSpread);

            Console.WriteLine("The day with the minimum spread is {0} and spread is {1}", minSpread.Item1, minSpread.Item2);
        }