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Looking ahead to post-M1

Posted by Bob Nystrom


Gilad is in Denmark with Lars and Kasper, and they spent a bunch of time discussing post-M1 stuff like:
- async
- mixins
- dynamic loading

But we don't have anything concrete just yet.

We're working to unify our fractured core libraries (dart2js and the native VM both have their own completely separate implementations of corelib, which makes lots of stuff annoying). Part of that is adding support for "external" methods. This will let us have a single core library that delegates the implementation of certain methods to implementation-specific (i.e. C++ or JS) code.

Lars says this "external" stuff is nice because it means you have one library to step into in the editor.

Gilad has added this to his under-development version of the spec, but it hasn't been released yet.

I brought up that people keep asking why our getter/setter syntax isn't more like C#. Lars says it's mostly a matter of taste. He likes that the current syntax is less verbose compared to C# when you aren't defining both a getter and a setter.

Kasper pointed out that C#-style properties have two levels of nesting which is unlike anything else in a class definition. Also, our current syntax is very close to the ECMAScript 6 syntax.

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Const, Static, Final, Oh my!

Posted by Seth Ladd

(This is an "oldie but a goodie" misc@dartlang.org post originally written by Bob Nystrom. It is being posted here as the explanations still ring true.)

Bob writes:


"static", "final", and "const" mean entirely distinct things in Dart:

"static" means a member is available on the class itself instead of on instances of the class. That's all it means, and it isn't used for anything else. static modifies *members*.

"final" means single-assignment: a final variable or field *must* have an initializer. Once assigned a value, a final variable's value cannot be changed. final modifies *variables*.

"const" has a meaning that's a bit more complex and subtle in Dart. const modifies *values*. You can use it when creating collections, like const [1, 2, 3], and when constructing objects (instead of new) like const Point(2, 3). Here, const means that the object's entire deep state can be determ…