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<h1 class="search-list">Search Results for <span></span></h1>
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<article class="content wrap" id="_content" data-uid="">
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<h2 id="x10d">X10D</h2>
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<p>X10D (pronounced <em>extend</em>), is a .NET package that provides extension methods for numerous types. The purpose of this library is to simplify a codebase by reducing the need for repeated code when performing common operations. Simplify your codebase. Take advantage of .NET. Use extension methods.</p>
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<p><em>(I'm also <a href="https://www.pcmag.com/encyclopedia/term/dogfooding">dogfooding</a> this library, so there's that.)</em></p>
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<h3 id="what-are-extension-methods">What are extension methods?</h3>
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<p>Extension methods are a clever .NET feature that augment existing types with new functionality. They are defined as
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static methods in a static class, and are called as if they were instance methods on the type they are extending. Take,
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for example, the following code:</p>
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<pre><code class="lang-csharp">public static class Program
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{
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public static void Main()
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{
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string str = "Hello, world!";
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Console.WriteLine(str.Reverse());
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}
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}
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public static class StringExtensions
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{
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public static string Reverse(this string str)
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{
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char[] chars = str.ToCharArray();
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Array.Reverse(chars);
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return new string(chars);
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}
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}
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</code></pre>
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<p>This will print <code>!dlrow ,olleH</code> to the console. The <code>Reverse</code> method is defined in the <code>StringExtensions</code> class, yet is
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called as if it were an instance method on the <code>str</code> variable, even though it's not.</p>
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<h3 id="why-use-extension-methods">Why use extension methods?</h3>
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<p>Extension methods were introduced when LINQ was added to .NET. LINQ is a set of extension methods that provide a way to
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query, filter, and transform data. If you were to access LINQ's methods statically, you would have to write code like
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this:</p>
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<pre><code class="lang-csharp">public static class Program
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{
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public static void Main()
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{
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int[] numbers = { 1, 2, 3, 4, 5 };
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IEnumerable<int> evenNumbers = Enumerable.Where(numbers, x => x % 2 == 0);
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IEnumerable<int> doubledNumbers = Enumerable.Select(evenNumbers, x => x * 2);
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int sum = Enumerable.Sum(doubledNumbers);
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Console.WriteLine(sum);
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}
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}
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</code></pre>
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<p>And if you wanted to one-line this, you'd have to write this:</p>
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<pre><code class="lang-csharp">public static class Program
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{
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public static void Main()
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{
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int[] numbers = { 1, 2, 3, 4, 5 };
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Console.WriteLine(Enumerable.Sum(Enumerable.Select(Enumerable.Where(numbers, x => x % 2 == 0), x => x * 2)));
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}
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}
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</code></pre>
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<p>This is a lot of code to write, and it's not very readable. The nested method calls make it incredibly difficult to
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follow. However, because LINQ is implemented as extension methods, you can write the following code instead:</p>
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<pre><code class="lang-csharp">public static class Program
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{
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public static void Main()
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{
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int[] numbers = { 1, 2, 3, 4, 5 };
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Console.WriteLine(numbers.Where(x => x % 2 == 0).Select(x => x * 2).Sum());
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}
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}
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</code></pre>
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<p>Because the methods are called as if they were instance methods on <code>IEnumerable<T></code>, they can be chained together,
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making the code much more readable.</p>
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<p>X10D aims to provide these same benefits as LINQ, but for dozens of other types and for countless other use cases.</p>
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</article>
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