typescript - 在 JavaScript 代碼中重構 switch-case 語句

我如何重構這段程式碼，以避免重複使用 dailogObj.image？如果不是案例 5 需要兩個賦值，我本來會寫一個 return 語句。

getDialogData(imageNum): any {

    const dailogObj = {
      image: '',
      buttonName: 'Learn More'
    };

    switch (imageNum) {
      case 1:
        dailogObj.image = '../../../assets/images/Red-Image.png';
        break;
      case 2:
        dailogObj.image = '../../../assets/images/blue-image-orgl.png';
        break;
      case 3:
        dailogObj.image = '../../../assets/images/Green-Image-2.png';
        break;
      case 4:
        dailogObj.image = '../../../assets/images/Gold-Image.png';
        break;
      case 5:
        dailogObj.image = '../../../assets/images/green-img-orgl.png';
        dailogObj.buttonName = 'Read Her Story';
        break;
      case  6:
        dailogObj.image = '../../../assets/images/Red-Image-2.png';
        break;
      case  7:
        dailogObj.image = '../../../assets/images/Blue-Image-2.png';
        break;
      case 8:
        dailogObj.image = '../../../assets/images/Gold-Image-2.png';
        break;
    }

    return dailogObj;
}

答案＃1

你可以將那個賦值抽取到它自己的條件中，然後只使用陣列來設定 image 屬性：

getDialogData(imageNum): any {
    const dailogObj = {
      image: '',
      buttonName: 'Learn More'
    };

    // Handle the default case if imageNum is not in range [1..9]
    if (imageNum >=1 && imageNum <=9) {
        // Special treatment of image number 5
        if (imageNum == 5) {
            dailogObj.buttonName = 'Read Her Story';
        }

        // If it is in range, pick the right image:
        var images = 
            ['../../../assets/imfages/Red-Image.png',
             '../../../assets/images/blue-image-orgl.png',
             '../../../assets/images/Green-Image-2.png',
             '../../../assets/images/Gold-Image.png',
             '../../../assets/images/green-img-orgl.png',
             '../../../assets/images/Red-Image-2.png',
             '../../../assets/images/Blue-Image-2.png',
             '../../../assets/images/Gold-Image-2.png']; 

        dailogObj.image = images[imageNum - 1];
    }
    return dailogObj;
}

答案＃2

images = {
    1: '../../../assets/images/Red-Image.png',
    2: '../../../assets/images/blue-image-orgl.png',
    ...
    8: '../../../assets/images/Gold-Image-2.png'
};

dailogObj.image = images[imageNum];
dailogObj.buttonName = imageNum == 5 ? 'Read Her Story' : 'Learn More';

或者你可以創建另一個物件來存儲按鈕名稱，就像圖片路徑一樣。