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Tracking Dart's M1 progress

Posted by Seth Ladd

We've compiled a list of some of the language features that are targeted for the M1 release of Dart. We hope this helps you track the features you are interested in. This list is a good way to associate a specific language change to its implementation in the Dart VM, Dart2js, and the Analyzer.

Be sure to star the bugs important to you, and you'll get notifications when the issues are closed.

As always, we really appreciate feedback on the Dart mailing list and Stack Overflow.

(This isn't a complete list, and of course things can change in the future.)

support const modifier for variables35493552Done @9992Done @8670
type included in this.xN/A
external functions3570Done @10144
allow non-constant initializers for fields103838493848Done @10233
stop treating final like const
lazy static init3557355935583476
operator syntax3765376637673768
operator == / remove ===3765
import scope1285294629453548
show:, hide:817345434533452
revised switch2862
static methods are constants1652340534063404
error -> warning: factories10313080Done3078
error -> warning: static calls1031308630853084
error -> warning: static getters1031308930883087
error -> warning: static setters1031309530943093
error -> warning: undefined constructors1031380238013800
support new catch syntax2948357837573756
remove old catch syntax
noSuchMethod API356435663565N/A
shadowing is not a warning3560N/AN/A3562
support new getter/setter syntax3602360936083607
remove old getter/setter syntax
first class types3368390339023904
remove abstract modifier on methods3898390139003899
remove interface declarations3966397339723971
Missing things?
library/import/source syntax/revisions?1378405040494048
redirecting factory constructors3966397039693968
detect if optional arg was passed4180426642654264
member cannot conflict with class name3284398839873986
constructor cannot conflict with member3040399139903989
revised parameter syntax4288429142904289

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Const, Static, Final, Oh my!

Posted by Seth Ladd

(This is an "oldie but a goodie" 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…