34 lines
1.0 KiB
C#
34 lines
1.0 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
|
|
namespace FruityFoundation.Base.Structures;
|
|
|
|
public static class MaybeExtensions
|
|
{
|
|
public static Maybe<T> FirstOrEmpty<T>(this IEnumerable<T> collection)
|
|
{
|
|
using var enumerator = collection.GetEnumerator();
|
|
|
|
return !enumerator.MoveNext() ? Maybe.Empty<T>() : enumerator.Current;
|
|
}
|
|
|
|
public static Maybe<T> FirstOrEmpty<T>(this IEnumerable<T> collection, Func<T, bool> pred)
|
|
{
|
|
foreach (var item in collection)
|
|
if (pred(item))
|
|
return item;
|
|
|
|
return Maybe.Empty<T>();
|
|
}
|
|
|
|
public static Maybe<TValue> TryGet<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key) =>
|
|
dict.TryGetValue(key, out var value) ? Maybe.Just(value) : Maybe.Empty<TValue>();
|
|
|
|
public static Maybe<TValue> TryGet<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dict, TKey key) =>
|
|
dict.TryGetValue(key, out var value) ? Maybe.Just(value) : Maybe.Empty<TValue>();
|
|
|
|
public static T? ToNullable<T>(this Maybe<T> item) where T : struct =>
|
|
item.HasValue ? item.Value : null;
|
|
}
|