BasicProgramming/MethodLibrary/Strings.cs

using System.Text;
using System.Text.Json;

namespace MethodLibrary
{
    public class Strings : IMethodCollection
    {
        public void DisplayAllMethods()
        {
            Console.WriteLine($"AddSeparator(\"ABCD\", \"^\"): {AddSeparator("ABCD", "^")}");
            Console.WriteLine($"AddSeparator(\"chocolate\", \"-\"): {AddSeparator("chocolate", "-")}");
            Console.WriteLine($"IsPalindrome(\"eye\"): {IsPalindrome("eye")}");
            Console.WriteLine($"IsPalindrome(\"home\"): {IsPalindrome("home")}");
            Console.WriteLine($"LengthOfAString(\"computer\"): {LengthOfAString("computer")}");
            Console.WriteLine($"LengthOfAString(\"ice cream\"): {LengthOfAString("ice cream")}");
            Console.WriteLine($"StringInReverseOrder(\"qwerty\"): {StringInReverseOrder("qwerty")}");
            Console.WriteLine($"StringInReverseOrder(\"oe93 kr\"): {StringInReverseOrder("oe93 kr")}");
            Console.WriteLine($"NumberOfWords(\"This is sample sentence\"): {NumberOfWords("This is sample sentence")}");
            Console.WriteLine($"NumberOfWords(\"OK\"): {NumberOfWords("OK")}");
            Console.WriteLine($"RevertWordsOrder(\"John Doe.\"): {RevertWordsOrder("John Doe.")}");
            Console.WriteLine($"RevertWordsOrder(\"A, B. C\"): {RevertWordsOrder("A, B. C")}");
            Console.WriteLine($"HowManyOccurrences(\"do it now\", \"do\"): {HowManyOccurrences("do it now", "do")}");
            Console.WriteLine($"HowManyOccurrences(\"empty\", \"d\"): {HowManyOccurrences("empty", "d")}");
            Console.WriteLine($"SortCharactersDescending(\"onomatopoeia\"): {JsonSerializer.Serialize(SortCharactersDescending("onomatopoeia"))}");
            Console.WriteLine($"SortCharactersDescending(\"fohjwf42os\"): {JsonSerializer.Serialize(SortCharactersDescending("fohjwf42os"))}");
            Console.WriteLine($"CompressString(\"kkkktttrrrrrrrrrr\"): {CompressString("kkkktttrrrrrrrrrr")}");
            Console.WriteLine($"CompressString(\"p555ppp7www\"): {CompressString("p555ppp7www")}");
        }

        public string AddSeparator(string str, string seperator)
        {
            return string.Join(seperator, str.ToList());
        }

        public bool IsPalindrome(string str)
        {
            bool isPalindrome = true;

            var stringParts = str.ToList();

            for (int i = 0; i < stringParts.Count - 1; i++)
            {
                if (!stringParts[i].Equals(stringParts[stringParts.Count - i - 1]))
                    isPalindrome = false;
            }

            return isPalindrome;
        }

        public int LengthOfAString(string str)
        {
            return str.Count();
        }

        public string StringInReverseOrder(string str)
        {
            return string.Join("", str.Reverse());
        }

        public int NumberOfWords(string str)
        {
            return str.Split(" ").Count();
        }

        public string RevertWordsOrder(string str)
        {
            return string.Join(" ", str.Split(" ").Reverse());
        }

        public int HowManyOccurrences(string str, string strToCheck)
        {
            return str.Split(" ").Count(x => x.Equals(strToCheck));
        }

        public char[] SortCharactersDescending(string str)
        {
            return str.OrderBy(x => (char)x).Reverse().ToArray();
        }

        public string CompressString(string str)
        {
            StringBuilder retval = new StringBuilder();

            int count = 1;

            for (int i = 1; i < str.Length; i++)
            {
                if (str[i] == str[i - 1])
                {
                    count++;
                }
                else
                {
                    retval.Append(str[i - 1]);
                    retval.Append(count);
                    count = 1;
                }
            }

            retval.Append(str[^1]);
            retval.Append(count);
            
            return retval.ToString();
        }
    }
}