public static int IndexWhere <T>(this ISeq <T> seq, Func <T, bool> predicate)
{
return(seq.IndexWhere(predicate, 0, seq.Length));
}
public static int IndexOf <T>(this ISeq <T> seq, object element, int start, int end)
{
return(element != null
? seq.IndexWhere(e => element.Equals(e), start, end)
: seq.IndexWhere(e => e == null, start, end));
}
