如何從打字稿中的字符串中獲取一種枚舉類型？

Question

我有一個枚舉：

export enum Suit {
  SPADES = "SPADES", 
  HEARTS = "HEARTS", 
  DIAMONDS = "DIAMONDS", 
  CLUBS = "CLUBS"
}

然后，當我嘗試使用它時：

for(let suit in Suit) {
    console.log(suit);
    console.log(typeof suit);
    const theSuit: Suit = Suit[suit];
}

VS代碼在theSuit處給出編譯錯誤： theSuit Type 'string' is not assignable to type 'Suit' 。

打字稿版本是3.2.2

我應該如何從字符串中獲取Suit的類型？

Answer 1

您可以使用類型斷言來告訴編譯器suit肯定是Suit的關鍵

export enum Suit {
    SPADES = "SPADES", 
    HEARTS = "HEARTS", 
    DIAMONDS = "DIAMONDS", 
    CLUBS = "CLUBS"
}

for(let suit in Suit) {
    console.log(suit);
    console.log(typeof suit);
    const theSuit: Suit = Suit[suit as keyof typeof Suit];
}