I need a modifiable collection like a List or a Set to be passed as a parameter. Using Iterable doesn't guarantee this argument to have methods like add or remove.

Example method:

void foo(Iterable bar) {
    bar.add(); // The method 'add' isn't defined for the type 'Iterable'.
}

Is there a class / interface for (modifiable) collections which guarantees those methods? If not, why?

CodePudding user response：

There is not a modifiable type. Very early (before Dart 1) we had some other types in our hierarchy, but we decided to avoid including them because things were getting a bit too complex.

I still wish we'd shipped a List interface without the mutation members.