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feat: Added AggregateOrDefault extension method

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This commit is contained in:
Austin Noska
2020-06-17 14:05:54 -04:00
committed by Chris Cameron
parent 4f34b3da7c
commit ee670487dd
2 changed files with 53 additions and 25 deletions
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1
CHANGELOG.md
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@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
### Added
- Added attributes for controlling obfuscation
- Added AggregateOrDefault extension method for applying an accumulator function over a sequence that returns a default value if the sequence is empty
## [12.0.0] - 2020-06-18
### Added

77
ICD.Common.Utils/Extensions/EnumerableExtensions.cs
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@@ -1407,24 +1407,7 @@ namespace ICD.Common.Utils.Extensions
if (extends == null)
throw new ArgumentNullException("extends");
Comparer<T> comparer = Comparer<T>.Default;
T value = default(T);
bool first = true;
foreach (T x in extends)
{
if (first)
{
first = false;
value = x;
continue;
}
if (comparer.Compare(x, value) < 0)
value = x;
}
return value;
return extends.AggregateOrDefault((a, b) => Comparer<T>.Default.Compare(a, b) < 0 ? a : b);
}
/// <summary>
@@ -1438,16 +1421,60 @@ namespace ICD.Common.Utils.Extensions
if (extends == null)
throw new ArgumentNullException("extends");
Comparer<T> comparer = Comparer<T>.Default;
T value = default(T);
return extends.AggregateOrDefault((a, b) => Comparer<T>.Default.Compare(a, b) > 0 ? a : b);
}
foreach (T x in extends)
/// <summary>
/// Applies an accumulator function over a sequence.
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="extends"></param>
/// <param name="func"></param>
/// <returns>The final accumulator value.</returns>
[CanBeNull]
public static TSource AggregateOrDefault<TSource>([NotNull] this IEnumerable<TSource> extends,
[NotNull] Func<TSource, TSource, TSource> func)
{
if (extends == null)
throw new ArgumentNullException("extends");
if (func == null)
throw new ArgumentNullException("func");
return extends.AggregateOrDefault(func, default(TSource));
}
/// <summary>
/// Applies an accumulator function over a sequence.
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="extends"></param>
/// <param name="func"></param>
/// <param name="defaultValue"></param>
/// <returns>The final accumulator value.</returns>
[CanBeNull]
public static TSource AggregateOrDefault<TSource>([NotNull] this IEnumerable<TSource> extends,
[NotNull] Func<TSource, TSource, TSource> func,
TSource defaultValue)
{
if (extends == null)
throw new ArgumentNullException("extends");
if (func == null)
throw new ArgumentNullException("func");
using (IEnumerator<TSource> enumerator = extends.GetEnumerator())
{
if (comparer.Compare(x, value) > 0)
value = x;
}
if (!enumerator.MoveNext())
return defaultValue;
return value;
TSource result = enumerator.Current;
while (enumerator.MoveNext())
result = func(result, enumerator.Current);
return result;
}
}
/// <summary>