My Linq

homework_16_05_25/MyLinq/.editorconfig

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+[*.cs]
+
+# SA1636: File header copyright text should match
+dotnet_diagnostic.SA1636.severity = none
+
+# SA1600: Elements should be documented
+dotnet_diagnostic.SA1600.severity = none
+
+# SA1633: File should have header
+dotnet_diagnostic.SA1633.severity = none

homework_16_05_25/MyLinq/MyLinq.Tests/MyLinq.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.4.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MyLinq\MyLinq.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>

homework_16_05_25/MyLinq/MyLinq.Tests/SequencesTest.cs

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+namespace MyLinq.Tests;
+
+public class SequencesTest
+{
+    private int[] array = new int[] { 1, 2, 3, 4, 5 };
+
+    [Test]
+    public void GetPrimesTest()
+    {
+        var primeNumbers = new int[] { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 };
+        var counter = 0;
+        foreach (var item in Sequences.GetPrimes())
+        {
+            if (counter == primeNumbers.Length)
+            {
+                break;
+            }
+
+            if (item != primeNumbers[counter])
+            {
+                Assert.Fail();
+            }
+
+            counter++;
+        }
+
+        Assert.Pass();
+    }
+
+    [Test]
+    public void TakeTest()
+    {
+        var expected = new[] { 1, 2, 3 };
+        var actual = this.array.Take(3);
+
+        Assert.That(expected, Is.EqualTo(actual));
+    }
+
+    [Test]
+    public void TakeNullReferenceExceptionTest()
+    {
+        IEnumerable<int>? nullSequence = null;
+        Assert.Throws<NullReferenceException>(()
+            => nullSequence!.Take(1).ToList());
+    }
+
+    [Test]
+    public void TakeArgumentOutOfRangeExceptionTest()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(()
+            => this.array.Take(-1).ToList());
+    }
+
+    [Test]
+    public void SkipTest()
+    {
+        var expected = new[] { 3, 4, 5 };
+        var actual = this.array.Skip(2);
+
+        Assert.That(expected, Is.EqualTo(actual));
+    }
+
+    [Test]
+    public void SkipNullReferenceExceptionTest()
+    {
+        IEnumerable<int>? nullSequence = null;
+        Assert.Throws<NullReferenceException>(()
+            => nullSequence!.Skip(1).ToList());
+    }
+
+    [Test]
+    public void SkipArgumentOutOfRangeExceptionTest()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(()
+            => this.array.Skip(-1).ToList());
+    }
+
+    [Test]
+    public void TheUseOfTwoOperationsTest()
+    {
+        var expected = new[] { 2, 3, 4 };
+        var actual = this.array.Skip(1).Take(3).ToArray();
+
+        Assert.That(expected, Is.EqualTo(actual));
+    }
+}

homework_16_05_25/MyLinq/MyLinq.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35806.99
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MyLinq", "MyLinq\MyLinq.csproj", "{ABCD93F0-8E7D-4728-B2E9-28DB81272A05}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MyLinq.Tests", "MyLinq.Tests\MyLinq.Tests.csproj", "{655AE165-57E7-4DD7-B468-BEBA54CA5B94}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{36D591C7-65C7-A0D1-1CBC-10CDE441BDC8}"
+	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{ABCD93F0-8E7D-4728-B2E9-28DB81272A05}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ABCD93F0-8E7D-4728-B2E9-28DB81272A05}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ABCD93F0-8E7D-4728-B2E9-28DB81272A05}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ABCD93F0-8E7D-4728-B2E9-28DB81272A05}.Release|Any CPU.Build.0 = Release|Any CPU
+		{655AE165-57E7-4DD7-B468-BEBA54CA5B94}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{655AE165-57E7-4DD7-B468-BEBA54CA5B94}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{655AE165-57E7-4DD7-B468-BEBA54CA5B94}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{655AE165-57E7-4DD7-B468-BEBA54CA5B94}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4F1E7F5A-3054-454C-A329-6562C4D211C8}
+	EndGlobalSection
+EndGlobal

homework_16_05_25/MyLinq/MyLinq/MyLinq.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <NoWarn>SA0001</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>

homework_16_05_25/MyLinq/MyLinq/Sequences.cs

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+// <copyright file="Sequences.cs" company="BengyaKirill">
+// Copyright (c) BengyaKirill under MIT License. All rights reserved.
+// </copyright>
+
+namespace MyLinq;
+
+/// <summary>
+/// Class for slave with sequences.
+/// </summary>
+public static class Sequences
+{
+    /// <summary>
+    /// Get a sequence of prime numbers.
+    /// </summary>
+    /// <returns>Sequence of prime numbers.</returns>
+    public static IEnumerable<int> GetPrimes()
+    {
+        int number = 2;
+        while (true)
+        {
+            if (IsPrime(number))
+            {
+                yield return number;
+            }
+
+            number++;
+        }
+
+        static bool IsPrime(int number)
+        {
+            int counter = 0;
+            for (var divider = 1; divider <= Math.Sqrt(number); divider++)
+            {
+                if (number % divider == 0)
+                {
+                    counter++;
+                    if (divider != number / divider)
+                    {
+                        counter++;
+                    }
+                }
+
+                if (counter >= 3)
+                {
+                    return false;
+                }
+            }
+
+            return counter == 2;
+        }
+    }
+
+    /// <summary>
+    /// Take a sequence of the first n elements of a sequence.
+    /// </summary>
+    /// <typeparam name="T">Parameter type of sequence elements.</typeparam>
+    /// <param name="seq">A sequence from which a
+    /// subsequence must be returned.</param>
+    /// <param name="n">The number of the element
+    /// to which you need to return.</param>
+    /// <returns>Subsequences of a sequence.</returns>
+    /// <exception cref="NullReferenceException">Zero sequence
+    /// transmitted.</exception>
+    /// <exception cref="ArgumentOutOfRangeException">Invalid parameter passed.</exception>
+    public static IEnumerable<T> Take<T>(this IEnumerable<T> seq, int n)
+    {
+        if (seq == null)
+        {
+            throw new NullReferenceException();
+        }
+
+        if (n < 0)
+        {
+            throw new ArgumentOutOfRangeException();
+        }
+
+        using var enumerator = seq.GetEnumerator();
+        for (var i = 0; i < n && enumerator.MoveNext(); i++)
+        {
+            yield return enumerator.Current;
+        }
+    }
+
+    /// <summary>
+    /// Get sequence without first n elements.
+    /// </summary>
+    /// <typeparam name="T">Parameter type of sequence elements.</typeparam>
+    /// <param name="seq">A sequence from which a
+    /// subsequence must be returned.</param>
+    /// <param name="n">The number of the element to skip to</param>
+    /// <returns>Subsequences of a sequence.</returns>
+    /// <exception cref="NullReferenceException">Zero sequence
+    /// transmitted.</exception>
+    /// <exception cref="ArgumentOutOfRangeException">
+    /// Invalid parameter passed.</exception>
+    public static IEnumerable<T> Skip<T>(this IEnumerable<T> seq, int n)
+    {
+        if (seq == null)
+        {
+            throw new NullReferenceException();
+        }
+
+        if (n < 0)
+        {
+            throw new ArgumentOutOfRangeException();
+        }
+
+        var counter = 0;
+        using var enumerator = seq.GetEnumerator();
+        while (enumerator.MoveNext())
+        {
+            if (counter < n)
+            {
+                counter++;
+                continue;
+            }
+
+            yield return enumerator.Current;
+        }
+    }
+}