How and when to use the Record type in dart and What is the difference between using it and other collection types like map, list, etc?

如何以及何时在dart中使用Record类型，以及使用它与其他集合类型（如map，list等）之间的区别是什么？

Also, In Dart doc it states that records are real values, what does that mean?

另外，在DART文档中，它指出记录是真实的价值，这是什么意思？

A record is not a "collection type". I think that is very misleading.

记录不是“集合类型”。我认为这非常具有误导性。

It is basically a very short and dynamic way to declare a class that holds fields and nothing else.

它基本上是一种非常简短和动态的方式来声明一个只包含字段的类。

For example ({int r, int g, int b}) color this is a variable of a type that has three fields of type int, named r, g and b.

例如({int r，int g，int b})COLOR这是一个类型的变量，它有三个int类型的字段，分别名为r、g和b。

You could have made a class:

你本可以上一堂课：

class Color {
   final int r;
   final int g;
   final int b;

   Color({this.r, this.b, this.g});
}

That would serve the same purpose, it's just a lot more work and a lot more class definitions. Because:

这将服务于相同的目的，只是有更多的工作和更多的类定义。因为：

Records automatically define hashCode and == methods based on the structure of their fields.

So it is a very practical and time saving way to use field-aggregates. Or "data holder classes". It is not a replacement for collections. Collections are a varying number of elements of the same type, records are a predefined number of varying types.

因此，使用字段集合体是一种非常实用和节省时间的方式。或“数据持有者类”。它不是收藏的替代品。集合是相同类型的不同数量的元素，记录是预定义数量的不同类型。

       /// this called record type 
    /// first you put your record's data types in brackets
    ///  the order is important
     /// [myRecord]  is the name of your record variable
     /// (1,'kururu' , 28)   remember the order  (num ID , Object name , num age)
    (num , Object , num)  myRecord = (1  ,"Kururu" ,28);
    
    void main(List<String> args) {

      //using record to initialize multi variables in one line
       //remember the order of your record  (INT ,STRING ,INT)
        // number ,name , age    are your variable 
// assign them to your record 
// and that's it:)
      var (number as int, name as String , age as int  ) = myRecord;
      print(number);
      print(name) ;
      print(age) ;
    
    }

something like this?

像这样的吗？