Map<TKey, TValue> should inherit from Iterable<MapEntry<TKey, TValue>>

[ahmednfwela]

Moved from dart-lang/language#3081

currently to iterate over a Map, you need to access the entries property, but you can't iterate over the map itself

this makes representing a union of Map | List a chore, since they have no common denominator, thus requiring changing the type to dynamic

[lrhn]

A map is not, will not, and cannot be an Iterable.

While some members can co-exist (Map has containsKey/containsValue and Iterable has contains),
the method forEach has incompatible types between the two interfaces.

So, it cannot be.

[ahmednfwela]

@lrhn why not ? C# has IDicitionary inheriting from IEnumerable just fine

methods that can't coexist in Map can be marked deprecated and removed at a later release as a breaking change

[lrhn]

In C#, a class can have two members with the same name, but different signatures.
I'm Dart that's not possible.
The forEach of the Map interface makes it impossible to implement Iterable too.

[ahmednfwela]

oh I see, so it's just blocked by dart-lang/language#1122

[lrhn]

Yes, "just" blocked on that. 😁