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#resource is going away, update your code

Posted by Seth Ladd


Today, Dart team member Kasper Lund notified us of a breaking change. The #resource directive is being removed from the spec and implementations. From the email:


We've decided to remove support for the #resource directive and
instead rely on metadata annotations for associating external
resources with Dart programs. I've submitted a change that removes the
support for #resource from dart2js in r11489 and the other
implementations (the VM and the analyzer) will also stop supporting
the tag in the near future.

Now is the time to remove any uses of #resource. Please drop by the mailing list if you have any questions. Thanks for trying Dart!

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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…