public static TSource FirstOrDefault <TSource>(this IReadOnlyList <TSource> source, Func <TSource, bool> predicate)
{
switch (source)
{
case TSource[] array:
return(ArrayExtensions.FirstOrDefault <TSource>(array, predicate));
default:
return(ReadOnlyList.FirstOrDefault <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(source, predicate));
}
}
public static TSource FirstOrDefault <TSource>(this IEnumerable <TSource> source)
{
switch (source)
{
case TSource[] array:
return(ArrayExtensions.FirstOrDefault <TSource>(array));
default:
return(FirstOrDefaultDowncasted <IEnumerable <TSource>, TSource> .FirstOrDefault(source));
}
}
