Init Scripts in new repo

Functional/OptionalStruct.cs

@@ -0,0 +1,40 @@
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+
+namespace SJK.Functional;
+
+public struct Option<T> : IEquatable<Option<T>>
+{
+    private readonly T? _value;
+    [MemberNotNullWhen(true, nameof(_value))]
+    public bool HasValue { get; }
+    public static Option<T> None => new(default, false);
+    public static Option<T> Some(T value) => new(value, true);
+    private Option(T? value, bool hasValue)
+    {
+        Debug.Assert(!(value is null && hasValue), "Can not create an option with a null value had say it has one");
+
+        _value = value;
+        HasValue = hasValue;
+    }
+    public T? Value => HasValue ? _value : throw new InvalidOperationException("Can not retrive value when there is no value.");
+
+    // [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public TResult Match<TResult>(Func<T, TResult> some, Func<TResult> none) => HasValue ? some(_value) : none();
+    // [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Option<TResult> Map<TResult>(Func<T, TResult> f) => HasValue ? Option<TResult>.Some(f(_value)) : Option<TResult>.None;
+    // [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Option<TResult> Bind<TResult>(Func<T, Option<TResult>> f) => HasValue ? f(_value) : Option<TResult>.None;
+    // [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public T OrDefault(T value) => HasValue ? _value : value;
+    // [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public T Or(Func<T> factory) => HasValue ? _value : factory();
+
+    public override bool Equals([NotNullWhen(true)] object? obj) => obj is Option<T> other && Equals(other);
+
+    public bool Equals(Option<T> other) => (HasValue == other.HasValue) && (!HasValue || EqualityComparer<T>.Default.Equals(_value, other._value));
+
+    public override int GetHashCode() => HasValue ? EqualityComparer<T>.Default.GetHashCode(_value) : 0;
+    public override string ToString() => HasValue ? $"Some({_value})" : $"None<{typeof(T).Name}>()";
+}