Map列表<future<object> &gt; 进入列表<object><div id="text_translate"><p>我有一个</p><pre class="lang-dart prettyprint-override">List&lt;Future&lt;int&gt;&gt;</pre><p> 我如何将其转换为</p><pre class="lang-dart prettyprint-override">List&lt;int&gt;</pre> </div></object></future<object>

Question

I have a

List<Future<int>> 

how do I transform it into a

List<int> 

Answer 1

Credit goes to @pskink

This is how you can do it:

  List<int> resultSet = [];

  List<Future<int>> methods = [];

  resultSet = await Future.wait(methods);

You can also do it like this:

  List<int> resultSet = [];

  List<Future<int>> methods = [];

  await Future.wait(methods).then((value) {
    resultSet = value;
  });

  print(resultSet);

More about Future/wait

Answer 2

If I have a hint at what you are trying to do, here is my suggestion.

• You have a future inside a list, meaning you should await the result of the class itself before adding it to your list.
• after doing that, you can then do something like this, to convert it to a map:

    var myMap = Map.fromIterable(myList, key: (myClassInstanceVariable) => myClassInstanceVariable.variable1, value: (myClassInstanceVariable) => myClassInstanceVariable.variable1Value);

I would have really loved it, if there was something like a more detailed explanation, so I can see how to help you with the Future. for that, I would suggest future builder

FutureBuilder<YourClass>(
    future: theAsyncMethodThatGetsYourClass,
    builder: (context, snapshot){
    //some code
    });