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Merged
SimonCropp merged 1 commit into from
May 4, 2026
Merged

IEnumerable.Prepend #544

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2 changes: 1 addition & 1 deletion apiCount.include.md
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@@ -1,4 +1,4 @@
**API count: 929**
**API count: 930**

### Per Target Framework

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1 change: 1 addition & 0 deletions api_list.include.md
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Expand Up @@ -491,6 +491,7 @@
* `TSource? Min<TSource>(IComparer<TSource>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.min?view=net-11.0#system-linq-enumerable-min-1(system-collections-generic-ienumerable((-0))-system-collections-generic-icomparer((-0))))
* `TSource? MinBy<TSource, TKey>(Func<TSource, TKey>, IComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.minby?view=net-11.0#system-linq-enumerable-minby-2(system-collections-generic-ienumerable((-0))-system-func((-0-1))-system-collections-generic-icomparer((-1))))
* `TSource? MinBy<TSource, TKey>(Func<TSource, TKey>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.minby?view=net-11.0#system-linq-enumerable-minby-2(system-collections-generic-ienumerable((-0))-system-func((-0-1))))
* `IEnumerable<TSource> Prepend<TSource>(TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.prepend?view=net-11.0)
* `TSource SingleOrDefault<TSource>(Func<TSource, bool>, TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault?view=net-11.0#system-linq-enumerable-singleordefault-1(system-collections-generic-ienumerable((-0))-system-func((-0-system-boolean))-0))
* `TSource SingleOrDefault<TSource>(TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault?view=net-11.0#system-linq-enumerable-singleordefault-1(system-collections-generic-ienumerable((-0))-0))
* `IEnumerable<TSource> SkipLast<TSource>(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.skiplast?view=net-11.0)
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4 changes: 2 additions & 2 deletions assemblySize.include.md
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Expand Up @@ -6,7 +6,7 @@
| netstandard2.1 | 8.5KB | 258.0KB | +249.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net461 | 8.5KB | 303.5KB | +295.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net462 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net47 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
| net47 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net471 | 8.5KB | 306.5KB | +298.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net472 | 8.5KB | 305.5KB | +297.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
| net48 | 8.5KB | 305.5KB | +297.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
Expand All @@ -33,7 +33,7 @@
| netstandard2.1 | 8.5KB | 372.0KB | +363.5KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net461 | 8.5KB | 443.8KB | +435.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net462 | 7.0KB | 447.3KB | +440.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net47 | 7.0KB | 447.0KB | +440.0KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
| net47 | 7.0KB | 447.0KB | +440.0KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net471 | 8.5KB | 446.2KB | +437.7KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net472 | 8.5KB | 444.1KB | +435.6KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
| net48 | 8.5KB | 444.1KB | +435.6KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
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7 changes: 4 additions & 3 deletions readme.md
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Expand Up @@ -13,7 +13,7 @@ The package targets `netstandard2.0` and is designed to support the following ru
* `uap10`


**API count: 929**<!-- include: apiCount. path: /apiCount.include.md -->
**API count: 930**<!-- include: apiCount. path: /apiCount.include.md -->

### Per Target Framework

Expand Down Expand Up @@ -100,7 +100,7 @@ This project uses features from the current stable SDK and C# language. As such
| netstandard2.1 | 8.5KB | 258.0KB | +249.5KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net461 | 8.5KB | 303.5KB | +295.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net462 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net47 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
| net47 | 7.0KB | 307.0KB | +300.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net471 | 8.5KB | 306.5KB | +298.0KB | +9.0KB | +6.5KB | +9.0KB | +14.0KB |
| net472 | 8.5KB | 305.5KB | +297.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
| net48 | 8.5KB | 305.5KB | +297.0KB | +9.0KB | +6.5KB | +9.0KB | +13.5KB |
Expand All @@ -127,7 +127,7 @@ This project uses features from the current stable SDK and C# language. As such
| netstandard2.1 | 8.5KB | 372.0KB | +363.5KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net461 | 8.5KB | 443.8KB | +435.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net462 | 7.0KB | 447.3KB | +440.3KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net47 | 7.0KB | 447.0KB | +440.0KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
| net47 | 7.0KB | 447.0KB | +440.0KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net471 | 8.5KB | 446.2KB | +437.7KB | +16.7KB | +8.2KB | +13.9KB | +19.4KB |
| net472 | 8.5KB | 444.1KB | +435.6KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
| net48 | 8.5KB | 444.1KB | +435.6KB | +16.7KB | +8.2KB | +13.9KB | +18.9KB |
Expand Down Expand Up @@ -1022,6 +1022,7 @@ The class `Polyfill` includes the following extension methods:
* `TSource? Min<TSource>(IComparer<TSource>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.min?view=net-11.0#system-linq-enumerable-min-1(system-collections-generic-ienumerable((-0))-system-collections-generic-icomparer((-0))))
* `TSource? MinBy<TSource, TKey>(Func<TSource, TKey>, IComparer<TKey>?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.minby?view=net-11.0#system-linq-enumerable-minby-2(system-collections-generic-ienumerable((-0))-system-func((-0-1))-system-collections-generic-icomparer((-1))))
* `TSource? MinBy<TSource, TKey>(Func<TSource, TKey>)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.minby?view=net-11.0#system-linq-enumerable-minby-2(system-collections-generic-ienumerable((-0))-system-func((-0-1))))
* `IEnumerable<TSource> Prepend<TSource>(TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.prepend?view=net-11.0)
* `TSource SingleOrDefault<TSource>(Func<TSource, bool>, TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault?view=net-11.0#system-linq-enumerable-singleordefault-1(system-collections-generic-ienumerable((-0))-system-func((-0-system-boolean))-0))
* `TSource SingleOrDefault<TSource>(TSource)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault?view=net-11.0#system-linq-enumerable-singleordefault-1(system-collections-generic-ienumerable((-0))-0))
* `IEnumerable<TSource> SkipLast<TSource>(int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.skiplast?view=net-11.0)
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1 change: 1 addition & 0 deletions src/Consume/Consume.cs
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Expand Up @@ -928,6 +928,7 @@ void IEnumerable_Methods()
};
enumerable.TryGetNonEnumeratedCount(out var count);
var append = enumerable.Append("c");
var prepend = enumerable.Prepend("c");
var maxBy = enumerable.MaxBy(_ => _);
var chunk = enumerable.Chunk(3);
var minBy = enumerable.MinBy(_ => _);
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2 changes: 1 addition & 1 deletion src/Directory.Build.props
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Expand Up @@ -2,7 +2,7 @@
<Project>
<PropertyGroup>
<NoWarn>CS1591;NETSDK1138;NU1901;NU1902;NU1903;CA1822;CA1847;CA1861;NU1510;NU1608;NU1109</NoWarn>
<Version>10.4.0</Version>
<Version>10.5.0</Version>
<AssemblyVersion>1.0.0</AssemblyVersion>
<PackageTags>Polyfill</PackageTags>
<DisableImplicitNamespaceImports>true</DisableImplicitNamespaceImports>
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4 changes: 2 additions & 2 deletions src/Directory.Packages.props
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Expand Up @@ -6,8 +6,8 @@
<ItemGroup>
<PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.2.0" />
<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" Pinned="true" />
<PackageVersion Include="TUnit" Version="1.37.36" />
<PackageVersion Include="ProjectDefaults" Version="1.0.173" />
<PackageVersion Include="TUnit" Version="1.43.11" />
<PackageVersion Include="ProjectDefaults" Version="1.0.174" />
<PackageVersion Include="Microsoft.Bcl.Memory" Version="10.0.7" />
<PackageVersion Include="ProjectFiles" Version="1.1.1" />
<PackageVersion Include="System.Memory" Version="4.6.3" />
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25 changes: 25 additions & 0 deletions src/Polyfill/Polyfill_IEnumerable_Prepend.cs
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#if NET46X || NET47

namespace Polyfills;

using System.Collections.Generic;

static partial class Polyfill
{
/// <summary>
/// Adds a value to the beginning of the sequence.
/// </summary>
//Link: https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.prepend?view=net-11.0
public static IEnumerable<TSource> Prepend<TSource>(
this IEnumerable<TSource> target,
TSource element)
{
yield return element;

foreach (var item in target)
{
yield return item;
}
}
}
#endif
20 changes: 20 additions & 0 deletions src/Split/net461/Polyfill_IEnumerable_Prepend.cs
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// <auto-generated />
#pragma warning disable
namespace Polyfills;
using System.Collections.Generic;
static partial class Polyfill
{
/// <summary>
/// Adds a value to the beginning of the sequence.
/// </summary>
public static IEnumerable<TSource> Prepend<TSource>(
this IEnumerable<TSource> target,
TSource element)
{
yield return element;
foreach (var item in target)
{
yield return item;
}
}
}
20 changes: 20 additions & 0 deletions src/Split/net462/Polyfill_IEnumerable_Prepend.cs
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// <auto-generated />
#pragma warning disable
namespace Polyfills;
using System.Collections.Generic;
static partial class Polyfill
{
/// <summary>
/// Adds a value to the beginning of the sequence.
/// </summary>
public static IEnumerable<TSource> Prepend<TSource>(
this IEnumerable<TSource> target,
TSource element)
{
yield return element;
foreach (var item in target)
{
yield return item;
}
}
}
20 changes: 20 additions & 0 deletions src/Split/net47/Polyfill_IEnumerable_Prepend.cs
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@@ -0,0 +1,20 @@
// <auto-generated />
#pragma warning disable
namespace Polyfills;
using System.Collections.Generic;
static partial class Polyfill
{
/// <summary>
/// Adds a value to the beginning of the sequence.
/// </summary>
public static IEnumerable<TSource> Prepend<TSource>(
this IEnumerable<TSource> target,
TSource element)
{
yield return element;
foreach (var item in target)
{
yield return item;
}
}
}
8 changes: 8 additions & 0 deletions src/Tests/PolyfillTests_IEnumerable.cs
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Expand Up @@ -168,6 +168,14 @@ public async Task IEnumerableAppend()
await Assert.That(enumerable.Append("c").SequenceEqual(["a", "b", "c"])).IsTrue();
}

[Test]
public async Task IEnumerablePrepend()
{
IEnumerable<string> enumerable = ["b", "c"];

await Assert.That(enumerable.Prepend("a").SequenceEqual(["a", "b", "c"])).IsTrue();
}

[Test]
public async Task IEnumerableSkipLast()
{
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