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<article class="content wrap" id="_content" data-uid="IPA.Utilities.EnumerableExtensions">
<h1 id="IPA_Utilities_EnumerableExtensions" data-uid="IPA.Utilities.EnumerableExtensions" class="text-break">Class EnumerableExtensions
</h1>
<div class="markdown level0 summary"><p>Extensions for <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable&lt;T&gt;</a> that don&apos;t currently exist in <code>System.Linq</code>.</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object">Object</a></div>
<div class="level1"><span class="xref">EnumerableExtensions</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.tostring#System_Object_ToString">Object.ToString()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#System_Object_Equals_System_Object_">Object.Equals(Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#System_Object_Equals_System_Object_System_Object_">Object.Equals(Object, Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.referenceequals#System_Object_ReferenceEquals_System_Object_System_Object_">Object.ReferenceEquals(Object, Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gethashcode#System_Object_GetHashCode">Object.GetHashCode()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gettype#System_Object_GetType">Object.GetType()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.memberwiseclone#System_Object_MemberwiseClone">Object.MemberwiseClone()</a>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="IPA.Utilities.html">IPA.Utilities</a></h6>
<h6><strong>Assembly</strong>: IPA.Loader.dll</h6>
<h5 id="IPA_Utilities_EnumerableExtensions_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static class EnumerableExtensions</code></pre>
</div>
<h3 id="methods">Methods
</h3>
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<a id="IPA_Utilities_EnumerableExtensions_Append_" data-uid="IPA.Utilities.EnumerableExtensions.Append*"></a>
<h4 id="IPA_Utilities_EnumerableExtensions_Append__1_System_Collections_Generic_IEnumerable___0____0_" data-uid="IPA.Utilities.EnumerableExtensions.Append``1(System.Collections.Generic.IEnumerable{``0},``0)">Append&lt;T&gt;(IEnumerable&lt;T&gt;, T)</h4>
<div class="markdown level1 summary"><p>Adds a value to the end of the sequence.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; Append&lt;T&gt;(this IEnumerable&lt;T&gt; seq, T app)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><span class="parametername">seq</span></td>
<td><p>a sequence of values</p>
</td>
</tr>
<tr>
<td><span class="xref">T</span></td>
<td><span class="parametername">app</span></td>
<td><p>the value to append to <code data-dev-comment-type="paramref" class="paramref">seq</code></p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a new sequence ending with <code data-dev-comment-type="paramref" class="paramref">app</code></p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the type of the elements of <code data-dev-comment-type="paramref" class="paramref">seq</code></p>
</td>
</tr>
</tbody>
</table>
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<a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>
<h4 id="IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable___0__" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``1(System.Collections.Generic.IEnumerable{``0})">NonNull&lt;T&gt;(IEnumerable&lt;T&gt;)</h4>
<div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T&gt;(this IEnumerable&lt;T&gt; self)
where T : class</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><span class="parametername">self</span></td>
<td><p>the enumeration to filter</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a filtered enumerable</p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the type of the enumeration</p>
</td>
</tr>
</tbody>
</table>
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<a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>
<h4 id="IPA_Utilities_EnumerableExtensions_NonNull__1_System_Collections_Generic_IEnumerable_System_Nullable___0___" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``1(System.Collections.Generic.IEnumerable{System.Nullable{``0}})">NonNull&lt;T&gt;(IEnumerable&lt;Nullable&lt;T&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements from an enumeration of nullable types.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T&gt;(this IEnumerable&lt;T?&gt; self)
where T : struct</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.nullable-1">Nullable</a>&lt;T&gt;&gt;</td>
<td><span class="parametername">self</span></td>
<td><p>the enumeration to filter</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a filtered enumerable</p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the underlying type of the nullable enumeration</p>
</td>
</tr>
</tbody>
</table>
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<a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>
<h4 id="IPA_Utilities_EnumerableExtensions_NonNull__2_System_Collections_Generic_IEnumerable___0__System_Func___0___1__" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``2(System.Collections.Generic.IEnumerable{``0},System.Func{``0,``1})">NonNull&lt;T, U&gt;(IEnumerable&lt;T&gt;, Func&lt;T, U&gt;)</h4>
<div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration based on a converter.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T, U&gt;(this IEnumerable&lt;T&gt; self, Func&lt;T, U&gt; pred)
where U : class</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><span class="parametername">self</span></td>
<td><p>the enumeration to filter</p>
</td>
</tr>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.func-2">Func</a>&lt;T, U&gt;</td>
<td><span class="parametername">pred</span></td>
<td><p>the predicate to select for filtering</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a filtered enumerable</p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the type of the enumeration</p>
</td>
</tr>
<tr>
<td><span class="parametername">U</span></td>
<td><p>the type to compare to null</p>
</td>
</tr>
</tbody>
</table>
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<a id="IPA_Utilities_EnumerableExtensions_NonNull_" data-uid="IPA.Utilities.EnumerableExtensions.NonNull*"></a>
<h4 id="IPA_Utilities_EnumerableExtensions_NonNull__2_System_Collections_Generic_IEnumerable___0__System_Func___0_System_Nullable___1___" data-uid="IPA.Utilities.EnumerableExtensions.NonNull``2(System.Collections.Generic.IEnumerable{``0},System.Func{``0,System.Nullable{``1}})">NonNull&lt;T, U&gt;(IEnumerable&lt;T&gt;, Func&lt;T, Nullable&lt;U&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>LINQ-style extension method that filters <span class="xref">null</span> elements out of an enumeration based on a converter to a nullable type.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; NonNull&lt;T, U&gt;(this IEnumerable&lt;T&gt; self, Func&lt;T, U?&gt; pred)
where U : struct</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><span class="parametername">self</span></td>
<td><p>the enumeration to filter</p>
</td>
</tr>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.func-2">Func</a>&lt;T, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.nullable-1">Nullable</a>&lt;U&gt;&gt;</td>
<td><span class="parametername">pred</span></td>
<td><p>the predicate to select for filtering</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a filtered enumerable</p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the type of the enumeration</p>
</td>
</tr>
<tr>
<td><span class="parametername">U</span></td>
<td><p>the type of the predicate&apos;s resulting nullable</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="IPA_Utilities_EnumerableExtensions_Prepend__1_System_Collections_Generic_IEnumerable___0____0_" data-uid="IPA.Utilities.EnumerableExtensions.Prepend``1(System.Collections.Generic.IEnumerable{``0},``0)">Prepend&lt;T&gt;(IEnumerable&lt;T&gt;, T)</h4>
<div class="markdown level1 summary"><p>Adds a value to the beginning of the sequence.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static IEnumerable&lt;T&gt; Prepend&lt;T&gt;(this IEnumerable&lt;T&gt; seq, T prep)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><span class="parametername">seq</span></td>
<td><p>a sequence of values</p>
</td>
</tr>
<tr>
<td><span class="xref">T</span></td>
<td><span class="parametername">prep</span></td>
<td><p>the value to prepend to <code data-dev-comment-type="paramref" class="paramref">seq</code></p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;T&gt;</td>
<td><p>a new sequence beginning with <code data-dev-comment-type="paramref" class="paramref">prep</code></p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td><p>the type of the elements of <code data-dev-comment-type="paramref" class="paramref">seq</code></p>
</td>
</tr>
</tbody>
</table>
</article>
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