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class ListStockExchange : public StockExchange {

private:
  std::list<Trade *> * trades;

public:
  ListStockExchange() {
      trades = new std::list<Trade *>();
  }

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bandrzejczak

class ListStockExchange : public StockExchange{

private:
  std::list<Trade *> * trades;

public:
  ListStockExchange() {
      trades = new std::list<Trade *>();
  }

bandrzejczak

public class ArrayListStockExchange implements StockExchange {

    private List<Trade> trades = new ArrayList<>();

    @Override
    public void order(int ticket, int amount, int price, boolean buy) {
        trades.add(new Trade(ticket, amount, price, buy));
    }

    @Override

bandrzejczak

def getSongLength(
    artist: Artist,
    albumName: String,
    songName: String): Option[Int] = {

    for {
        album <- artist.getAlbum(albumName)
        song  <- album.getSong(songName)
    } yield song.getLength
}

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Integer getSongLength(Artist artist, String albumName, String songName){
  return artist
    .getAlbum(albumName)
    .map(a -> a.getSong(songName))
    .map(Song::getTime)
    .orElseThrow(() -> new NoSuchSongException(artist, albumName, songName));
}

bandrzejczak

Integer getSongLength(
    Artist artist,
    String albumName,
    String songName) {

  Album album = artist.getAlbum(albumName);
  if (album != null) {
    Song song = album.getSong(songName);
    if (song != null) {
      return song.getLength();

bandrzejczak

def plotSquares(n, plotter):
  for x in range(0, n + 1):
      plotter.plot(Point(x, x * x))