MapFilterFold

MapFilterFold/MapFilterFold.Src/Functions.cs

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+using System.Security.Cryptography;
+using System.Xml.XPath;
+
+namespace MyFunctions;
+
+public class MapFilterFold
+{
+    public static List<T> Map<T>(List<T>? input, Func<T, T>? Function)
+    {
+        ArgumentNullException.ThrowIfNull(input);
+        ArgumentNullException.ThrowIfNull(Function);
+        var result = new List<T>();
+        foreach (var item in input)
+        {
+            result.Add(Function(item));
+        }
+        return result;
+    }
+
+    public static List<T> Filter<T>(List<T>? input, Func<T, bool>? Filter)
+    {
+        ArgumentNullException.ThrowIfNull(input);
+        ArgumentNullException.ThrowIfNull(Filter);
+        var result = new List<T>();
+        foreach (var item in input)
+        {
+            if (Filter(item))
+            {
+                result.Add(item);
+            }
+        }
+        return result;
+    }
+
+    public static T Fold<T>(List<T>? input, T startValue, Func<T, T, T>? AccumulateValue)
+    {
+        ArgumentNullException.ThrowIfNull(input);
+        ArgumentNullException.ThrowIfNull(AccumulateValue);
+        T result = startValue;
+        foreach (var item in input)
+        {
+            result = AccumulateValue(result, item);
+        }
+        return result;
+    }
+}

MapFilterFold/MapFilterFold.Src/MapFilterFold.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

MapFilterFold/MapFilterFold.Tests/MapFilterFold.Test.cs

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+using System.ComponentModel;
+using System.Security.Cryptography.X509Certificates;
+
+namespace MapFilterFold.Tests;
+
+using MyFunctions;
+
+public class Tests
+{
+    private static readonly List<int>? intInput = [23, 543, 654, 1, 0, 5];
+    private static readonly List<string> stringInput = ["abcdefg", "qwerty", "jbdfg;abf"];
+
+    [Test]
+    public void MapTest()
+    {
+        List<int> intAnswers = [1, 1, 0, 1, 0, 1];
+        var intResult = MapFilterFold.Map<int>(intInput, x => x % 2);
+        Assert.That(intResult, Is.EqualTo(intAnswers));
+
+        List<string> stringsAnswers = ["aceg", "qet", "jdgaf"];
+        var stringResult = MapFilterFold.Map(stringInput, RemoveEven);
+        Assert.That(stringResult, Is.EqualTo(stringsAnswers));
+    }
+
+    [Test]
+    public void FilterTest()
+    {
+        List<int> intAnswers = [654, 0];
+        var intResult = MapFilterFold.Filter<int>(intInput, x => x % 2 == 0);
+        Assert.That(intResult, Is.EqualTo(intAnswers));
+
+        List<string> stringsAnswers = ["qwerty"];
+        var stringResult = MapFilterFold.Filter(stringInput, x => x.Length == 6);
+        Assert.That(stringResult, Is.EqualTo(stringsAnswers));
+    }
+
+    [Test]
+    public void FoldTest()
+    {
+        int intAnswer = 1226;
+        var intResult = MapFilterFold.Fold<int>(intInput, 0, (x, y) => x + y);
+        Assert.That(intResult, Is.EqualTo(intAnswer));
+
+        string stringAnswer = "aqj";
+        var stringResult = MapFilterFold.Fold(stringInput, "", BuildString);
+        Assert.That(stringResult, Is.EqualTo(stringAnswer));
+    }
+
+    static string BuildString(string startValue, string currentValue) => startValue + currentValue[0];
+
+    static string RemoveEven(string input)
+    {
+        var array = new char[input.Length / 2 + (input.Length % 2 == 0 ? 0 : 1)];
+        int c = 0;
+        for (int i = 0; i < input.Length; ++i)
+        {
+            if (i % 2 == 0)
+            {
+                array[c] = input[i];
+                c += 1;
+            }
+        }
+        return new string(array);
+    }
+}

MapFilterFold/MapFilterFold.Tests/MapFilterFold.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MapFilterFold.Src\MapFilterFold.csproj" />
+  </ItemGroup>
+
+</Project>

MapFilterFold/MapFilterFold.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MapFilterFold", "MapFilterFold.Src\MapFilterFold.csproj", "{78056446-2F9C-4600-B17D-BD6D8C6586ED}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MapFilterFold.Tests", "MapFilterFold.Tests\MapFilterFold.Tests.csproj", "{69C94E85-2EA5-443F-A384-FCAA9134820B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{78056446-2F9C-4600-B17D-BD6D8C6586ED}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{78056446-2F9C-4600-B17D-BD6D8C6586ED}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{78056446-2F9C-4600-B17D-BD6D8C6586ED}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{78056446-2F9C-4600-B17D-BD6D8C6586ED}.Release|Any CPU.Build.0 = Release|Any CPU
+		{69C94E85-2EA5-443F-A384-FCAA9134820B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{69C94E85-2EA5-443F-A384-FCAA9134820B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{69C94E85-2EA5-443F-A384-FCAA9134820B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{69C94E85-2EA5-443F-A384-FCAA9134820B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal