public static IndexedItem <TSource> FirstIndexedItem <TSource>(this IEnumerable <TSource> source, Func <TSource, bool> predicate)
{
Assert.IsNotNull(source);
Assert.IsNotNull(predicate);
var firstIndex = -1;
var firstItem = default(TSource);
foreach (var item in source)
{
++firstIndex;
if (predicate(item))
{
firstItem = item;
break;
}
}
return(IndexedItem.Create(firstIndex, firstItem));
}
public static IndexedItem <TSource> ExtremumIndexedItem <TSource>(this IEnumerable <TSource> source, Func <TSource, TSource, bool> firstArgumentIsExtremum)
{
Assert.IsNotNull(source);
Assert.IsNotNull(firstArgumentIsExtremum);
var extremumIndex = -1;
var extremumItem = default(TSource);
var itemIndex = 0;
foreach (var item in source)
{
if (itemIndex == 0 || firstArgumentIsExtremum(item, extremumItem))
{
extremumIndex = itemIndex;
extremumItem = item;
}
++itemIndex;
}
return(IndexedItem.Create(extremumIndex, extremumItem));
}
