Add content

Benchmarks/ArrayBenchmarks.cs

@@ -0,0 +1,55 @@
+using BenchmarkDotNet.Attributes;
+using System.Collections;
+using System.Collections.Generic;
+
+public class ArrayBenchmarks
+{
+    int[]? array;
+
+    [Params(0, 1, 10, 1_000)]
+    public int Count { get; set; }
+
+    [GlobalSetup]
+    public void GlobalSetup()
+    {
+        array = Enumerable.Range(0, Count).ToArray();
+    }
+
+    [Benchmark(Baseline = true)]
+    public int ArrayFor()
+    {
+        var sum = 0;
+        for (var index = 0; index < Count; index++)
+            sum += array![index];
+        return sum;
+    }   
+
+    [Benchmark]
+    public int ArrayForeach()
+    {
+        var sum = 0;
+        foreach (var item in array!)
+            sum += item;
+        return sum;
+    }   
+
+    [Benchmark]
+    public int SpanFor()
+    {
+        var span = array!.AsSpan();
+        var sum = 0;
+        for (var index = 0; index < Count; index++)
+            sum += span[index];
+        return sum;
+    }   
+
+    [Benchmark]
+    public int SpanForeach()
+    {
+        var span = array!.AsSpan();
+        var sum = 0;
+        foreach (var item in span)
+            sum += item;
+        return sum;
+    }
+}

Benchmarks/Program.cs

@@ -8,7 +8,6 @@
 var config = DefaultConfig.Instance
     .WithSummaryStyle(SummaryStyle.Default.WithRatioStyle(RatioStyle.Trend))
     .AddDiagnoser(MemoryDiagnoser.Default)
-    .AddExporter(MarkdownExporter.Default)
     .AddExporter(MarkdownExporter.GitHub);
 
 BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args, config);

slidev/pages/ArrayMemorySpan.md

@@ -0,0 +1,67 @@
+---
+layout: section
+---
+
+# Array, Memory & Span
+
+---
+
+# Array, Memory & Span
+
+- Pull
+- Random
+- Special treatment by the JIT compiler
+
+--- 
+
+# `for` loop
+
+```csharp
+static int Sum(int[] source)
+{
+    var sum = 0;
+    for (var index = 0; index < source.Length; index++)
+        sum += source[index];
+    return sum;
+}   
+```
+
+[SharpLab](https://sharplab.io/#v2:EYLgxg9gTgpgtADwGwBYA+ABATABgLABQ2AjIRjgAQbEB0AMgJYB2AjgNyGEBuAhlBXyg8AnhQC8FAKJMArgFsYQ4ABsYNAEo8mAcxgAKHABoKxHAEoaAFQgBBKEOF6zHIsQCcegMry9gkWedOVyQKZgAXCm85PXCAbQBdCgBnCBkoMBgzQgBvQgp8il5+JPlxChwXAooAM2gKPSLQpgATGAQyiqbW9oAeZNT0tToYHTCACzYutoBqaayCKqqSuQppiRS0jNjmbvjKgowAdmT5FwBfAqA===)
+
+--- 
+
+# `foreach` loop
+
+```csharp
+static int Sum(int[] source)
+{
+  var sum = 0;
+  foreach (var item in source)
+    sum += item;
+  return sum;
+}   
+```
+
+---
+
+* Benchmarks 
+
+|       Method | Count |        Mean |     Error |    StdDev |        Ratio | RatioSD | Allocated | Alloc Ratio |
+|------------- |------ |------------:|----------:|----------:|-------------:|--------:|----------:|------------:|
+|     **ArrayFor** |    **10** |   **8.0370 ns** | **0.0310 ns** | **0.0290 ns** |     **baseline** |        **** |         **-** |          **NA** |
+| ArrayForeach |    10 |   3.9263 ns | 0.0192 ns | 0.0180 ns | 2.05x faster |   0.01x |         - |          NA |
+|      SpanFor |    10 |   9.6291 ns | 0.0412 ns | 0.0386 ns | 1.20x slower |   0.01x |         - |          NA |
+|  SpanForeach |    10 |   4.6778 ns | 0.0797 ns | 0.0746 ns | 1.72x faster |   0.03x |         - |          NA |
+|              |       |             |           |           |              |         |           |             |
+|     **ArrayFor** |  **1000** | **401.9290 ns** | **1.4809 ns** | **1.3852 ns** |     **baseline** |        **** |         **-** |          **NA** |
+| ArrayForeach |  1000 | 323.1575 ns | 0.8017 ns | 0.7499 ns | 1.24x faster |   0.01x |         - |          NA |
+|      SpanFor |  1000 | 326.9202 ns | 1.3916 ns | 1.3017 ns | 1.23x faster |   0.01x |         - |          NA |
+|  SpanForeach |  1000 | 323.4267 ns | 1.5112 ns | 1.4136 ns | 1.24x faster |   0.01x |         - |          NA |
+
+--- 
+
+# `foreach` compiled
+
+```csharp
+```
+

slidev/pages/ConsumingAnEnumerable.md

@@ -18,19 +18,7 @@ public static int Sum(IEnumerable<int> enumerable)
 }
 ```
 
----
-
-# `await foreach`
-
-```csharp {all|4}
-public static async ValueTask<int> SumAsync(IAsyncEnumerable<int> enumerable, CancellationToken token = default) 
-{
-  var sum = 0;
-  await foreach(var number in enumerable.WithCancellation(token))
-    sum += number;
-  return sum;
-}
-```
+[SharpLab](https://sharplab.io/#v2:EYLgxg9gTgpgtADwGwBYA+ABATABgLABQ2AjIRjgAQbEoDchhAbgIZQUDOEArlGDBQF4KAOxgB3ANoBdCgG8sAGgpYAvvSLEAnAAoAylwC22zjz4BKM+rLEkFAJbCALhX1HqAZgA8DxwD4KMMKGMFDMwAA2MGYUhLKEFBQsbOyGghQ46gkAZtAwzGAAFhTaSSKGwCH2wgFBBiFhkWbxCRypANRCtRVQmVQA7K0G6ipAA)
 
 ---
 
@@ -59,7 +47,23 @@ Does not check for `null`. `Enumerable&lt;T&gt;` should be used when there's not
 
 ---
 
-# compiled `await foreach`
+# async `foreach`
+
+```csharp {all|4}
+public static async ValueTask<int> SumAsync(IAsyncEnumerable<int> enumerable, CancellationToken token = default) 
+{
+  var sum = 0;
+  await foreach(var number in enumerable.WithCancellation(token))
+    sum += number;
+  return sum;
+}
+```
+
+[SharpLab]()
+
+---
+
+# compiled async `foreach`
 
 ```csharp {all|4|6|7}
 public static async ValueTask<int> SumAsync(IAsyncEnumerable<int> enumerable, CancellationToken token = default)