如何将dart中的2个或更多地图合并/合并到1个地图中?例如,我有类似的东西:
var firstMap = {"1":"2"};
var secondMap = {"1":"2"};
var thirdMap = {"1":"2"};
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我想要:
var finalMap = {"1":"2", "1":"2", "1":"2"};
Run Code Online (Sandbox Code Playgroud) 我想将字符串转换为map.
String value = "{first_name : fname,last_name : lname,gender : male, location : { state : state, country : country, place : place} }"
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成
Map = {
first_name : fname,
last_name : lname,
gender : male,
location = {
state : state,
country : country,
place : place
}
}
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如何将字符串转换为map<String, dynamic>值包含string,int,object和boolean的位置?
我想将字符串保存到文件中并从文件中获取数据.
鉴于:
Map<WebSocket,String> mListUser;
mListUser= new Map<WebSocket,String>();
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从我现在理解的添加新元素我应该做:
mListUser[socket]="string";
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而是我得到:
type 'String' is not a subtype of type 'int' of 'index'.
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我究竟做错了什么?