plus method

@override IVector<A> plus(covariant IVector<A> fa2)

Implementation

@override IVector<A> plus(IVector<A> fa2) {
  final int l = length();
  if (l == 0) {
    return fa2;
  } else {
    final int fa2l = fa2.length();
    if (fa2l == 0) {
      return this;
    } else if (l < fa2l) {
      return foldRight(fa2, (a, p) => p.prependElement(a));
    } else {
      return fa2.foldLeft(this, (p, a) => p.appendElement(a));
    }
  }
}