take method

@override IList<A> take(int n)

Returns a new collection containing only the first n elements.

Implementation

@override
IList<A> take(int n) {
  final nilA = Nil<A>();

  if (isEmpty || n <= 0) return nilA;

  final h = Cons(head, nilA);
  var t = h;
  var rest = tail;
  var i = 1;

  if (rest.isEmpty) return this;

  while (i < n) {
    if (rest.isEmpty) return this;

    i += 1;
    final nx = Cons(rest.head, nilA);
    t.next = nx;
    t = nx;
    rest = rest.tail;
  }

  return h;
}