public static Seq <A> Cons <A>(this A head, A[] tail)
{
if (tail == null || tail.Length == 0)
{
return(LSeq.FromSingleValue(head));
}
else
{
var data = new A[tail.Length + 1];
System.Array.Copy(tail, 0, data, 1, tail.Length);
data[0] = head;
return(LSeq.FromArray(data));
}
}
public static Seq <A> SeqOne <A>(A value) =>
value.IsNull()
? Empty
: LSeq.FromSingleValue(value);
public static Seq <A> Cons <A>(this A head, IEnumerable <A> tail) =>
tail == null?LSeq.FromSingleValue(head)
: tail is Seq <A> seq?head.Cons(seq)
: new Seq <A>(tail).Cons(head);
public static Seq <A> Cons <A>(this A head, SeqEmpty empty) => LSeq.FromSingleValue(head);
