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Rooted by: Function that adds the digits of an integer
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  • Description

    • Replaced the Where(char.IsDigit) with Math.Abs() for negatives

    • Changed from query format to method format

    • You can convert each digit to a number in .Sum(), no need to use select

    • Instead of using char.GetNumericValue(), you can avoid casting back to int by subtracting the char by 48, the ASCII value of '0', which will return an int

     Code 
    using System;
using System.Linq;
using System.Collections.Generic;

namespace Kumite
{
  public class Problem
  {
    public static int SumDigitsOf(long integer) => 
      Math.Abs(integer)
          .ToString()
          .Sum(x => x-48); 
    
  }
}
     Test Cases 
    namespace TestCases
{
    using NUnit.Framework;
    using System;
    using System.Collections.Generic;
    using System.Linq;

    [TestFixture]
    public class SolutionTests
    {
        readonly Dictionary<long, int> expected = new Dictionary<long, int>
        {
            { 234, 9 },
            { 366, 15 },
            { -741, 12 },
            { 2021, 5 },
            { 1998, 27 },
            { 1882, 19 },
            { -1492, 16 },
            { 999999999, 81 },
            { 12345678901234, 55 },
            { 99999999999999, 126 }
        };
      
        [Test]
        public void TestForProblemDescription()
        {
            Assert.AreEqual(6, Kumite.Problem.SumDigitsOf(10023));
        }
        
        [Test]
        public void Test10Samples()
        {
            foreach (var pair in expected)
            {
                Assert.AreEqual(pair.Value, Kumite.Problem.SumDigitsOf(pair.Key));
            }
        }
    }
}
    View Run Output
  • Code
    • using System;
    • using System.Linq;
    • using System.Collections.Generic;
    • namespace Kumite
    • {
    • public class Problem
    • {
    • public static int SumDigitsOf(long integer) => (int)(from ch in integer.ToString()
    • where Char.IsDigit(ch)
    • select Char.GetNumericValue(ch)).Sum();
    • public static int SumDigitsOf(long integer) =>
    • Math.Abs(integer)
    • .ToString()
    • .Sum(x => x-48);
    • }
    • }