颤动中的地图键是不是有“startsWith”方法？

Posted 2023-02-23

【中文标题】颤动中的地图键是不是有“startsWith”方法？

【英文标题】：Is there a "startsWith" method for map keys in flutter?颤动中的地图键是否有“startsWith”方法？

【发布时间】：2021-07-30 15:54:13

【问题描述】：

我是 Flutter 的初学者，我坚持将我的 API 获取的数据转换为我的自定义模型。 我正在使用一个为我提供这些数据的 API：

"meals":["idMeal":"52852","strMeal":"Tuna Nicoise","strDrinkAlternate":null,"strCategory":"Seafood",
"strArea":"French","strInstructions":"Heat oven to 200C\/fan 180C\/gas 6. Toss the potatoes with 2 tsp oil and some seasoning. Tip onto a large baking tray, then roast for 20 mins, stirring halfway, until crisp, golden and cooked through.\r\nMeanwhile, put eggs in a small pan of water, bring to the boil, then simmer for 8-10 mins, depending on how you like them cooked. Plunge into a bowl of cold water to cool for a few mins. Peel away the shells, then cut into halves.\r\nIn a large salad bowl, whisk together the remaining oil, red wine vinegar, capers and chopped tomatoes. Season, tip in the onion, spinach, tuna and potatoes, then gently toss together. Top with the eggs, then serve straight away.",
"strMealThumb":"https:\/\/www.themealdb.com\/images\/media\/meals\/yypwwq1511304979.jpg","strTags":null,
"strYoutube":"https:\/\/www.youtube.com\/watch?v=3_UAxkx0u6U",
"strIngredient1":"Potatoes","strIngredient2":"Olive Oil","strIngredient3":"Eggs","strIngredient4":"Red Wine Vinegar","strIngredient5":"Capers","strIngredient6":"Sunflower Oil","strIngredient7":"Red Onions","strIngredient8":"Spinach","strIngredient9":"Tuna","strIngredient10":"","strIngredient11":"","strIngredient12":"","strIngredient13":"","strIngredient14":"","strIngredient15":"","strIngredient16":"","strIngredient17":"","strIngredient18":"","strIngredient19":"","strIngredient20":"",
"strMeasure1":"450g","strMeasure2":"2 tblsp ","strMeasure3":"4","strMeasure4":"1 tbls","strMeasure5":"2 tblsp ","strMeasure6":"50g","strMeasure7":"\u00bd","strMeasure8":"100g ","strMeasure9":"400g","strMeasure10":"","strMeasure11":"","strMeasure12":"","strMeasure13":"","strMeasure14":"","strMeasure15":"","strMeasure16":"","strMeasure17":"","strMeasure18":"","strMeasure19":"","strMeasure20":"",
"strSource":"https:\/\/www.bbcgoodfood.com\/recipes\/9529\/winter-tuna-nioise",
"strImageSource":null,"strCreativeCommonsConfirmed":null,"dateModified":null]

我想将所有以“strIngredient”开头的键值存储到一个列表中，“strMeasure”也是如此

但是我还没有遇到可以做到上述的方法。

【参考方案1】：

您可以获取所有keys，然后根据您的情况检查每个。

Map<String,String> meals= api_data['meals'][0];

List<String> allKeys = meals.keys.toList();

for(String key in allKeys)
  if(key.startsWith("strIngredient"))
    print(meals[key]);