f# - 向 F# 可区分联合添加常量字段

Question

是否可以将常量字段值添加到 F# 区分联合？

我可以做这样的事情吗？

type Suit
  | Clubs("C")
  | Diamonds("D")
  | Hearts("H")
  | Spades("S")
  with
    override this.ToString() =
      // print out the letter associated with the specific item
  end

如果我正在编写 Java 枚举，我会向构造函数添加一个私有(private)值，如下所示:

public enum Suit {
  CLUBS("C"),
  DIAMONDS("D"),
  HEARTS("H"),
  SPADES("S");

  private final String symbol;

  Suit(final String symbol) {
    this.symbol = symbol;
  }

  @Override
  public String toString() {
    return symbol;
  }
}

Answer 1

只是为了完整起见，这意味着:

type Suit = 
  | Clubs
  | Diamonds
  | Hearts
  | Spades
  with
    override this.ToString() =
        match this with
        | Clubs -> "C"
        | Diamonds -> "D"
        | Hearts -> "H"
        | Spades -> "S"