flutter 如何在嵌套Map中搜索(过滤)并返回整个Map元素

kpbpu008 于 2022-11-25 发布在 Flutter

关注(0)|答案(2)|浏览(229)

我试图过滤Map，作为回报，我想要每一个过滤的Map元素。

代码：-

Map<String, Map<int, int>> temp = {Basic Terms: {1: 0}, Table and Column Naming Rules: {1: 1}};
var temp = temp.keys.where(element) => element.contains("basic"));
print(temp);

输出：-

I/flutter (30857): (Basic Terms)

我要的输出：-

I/flutter (30857): {Basic Terms: {1: 0}}

flutter

来源：https://stackoverflow.com/questions/74523041/how-to-searchfilter-in-nested-map-and-return-entire-map-elements

2条答案

按热度按时间

sdnqo3pr1#

您需要迭代entries而不是keys，然后将List<MapEntry>转换回Map：

Map<String, Map<int, int>> temp = {
  'Basic Terms': {1: 0}, 
  'Table and Column Naming Rules': {1: 1}
};

var temp2 = Map.fromEntries(
  temp.entries.where(
    (entry) => entry.key.contains('Basic Terms')
  )
);
print(temp2);

输出：

{Basic Terms: {1: 0}}

赞(0）回复(0）举报 2022-11-25

relj7zay2#

Map<String, Map<int, int>> temp = {'Basic Terms': {1: 0}, 'Table and Column Naming Rules': {1: 1}};
  var thisTemp = temp.entries.firstWhere((element) => element.key.contains("Basic"));
  print(thisTemp.toString());
}

赞(0）回复(0）举报 2022-11-25

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flutter 如何在嵌套Map中搜索(过滤)并返回整个Map元素

2条答案

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