public static int Count <TSource>(this IReadOnlyList <TSource> source, Func <TSource, bool> predicate)
{
switch (source)
{
case TSource[] array:
return(ArrayExtensions.Count <TSource>(array, predicate));
default:
return(ReadOnlyList.Count <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(source, predicate));
}
}
public static int Count <TSource>(this List <TSource> source, Func <TSource, bool> predicate) => ReadOnlyList.Count <List <TSource>, List <TSource> .Enumerator, TSource>(source, predicate);