相关疑难解决方法(0)

是什么区别const和final关键字飞镖？

I have initial data which works fine.

var data = {field1: FieldValue.increment(1)};

And it is also fine when I add another field to the data.

data.addAll({field2: FieldValue.increment(1)});

But if I set the value to 0, it won't allow me to.

data.addAll({field3: 0});

It will give an error of: The element type 'int' can't be assigned to the map value type 'FieldValue'.

I tried doing this but still, have the same issue.

data[field3] = 0;

How will I set the field3 …

在空安全之前有一个关于空安全的讨论。那么他们每个人之间又有什么关系呢？dynamicvarObject?

1. 是Object? == dynamic？
2. var?和怎么样dynamic?？
3. dynamic?和之间有什么区别吗dynamic？

我看到了官方文档null-safety，但找不到相关主题。