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Dart 1.13 brings improved JavaScript interoperability and more

Dart 1.13 is now available. With this release, you can more easily access JavaScript APIs from Dart code. We've also improved secure networking on the server.

Easier JavaScript interoperability


Dart 1.13 provides a new syntax for creating Dart API facades for existing JavaScript libraries. Facades have the benefits you expect from a Dart library: errors, warnings, and code navigation. They also provide the Dart-to-JavaScript compiler the structure needed to provide interoperability with low code size and runtime cost.

Example facade for Chart.js library

Use the js package to create Dart APIs for your favorite JavaScript libraries. We have an example port of the Chart.js library if you'd like to see how to use these new features in your code.

Graph generated with Chart.js and Dart
We're actively working on tools to generate JS facades from other typed-JavaScript implementations. To track progress, subscribe to this GitHub issue.

Improved secure networking


As we mentioned in September, Dart has transitioned to BoringSSL – a streamlined, Google-maintained implementation of OpenSSL. As part of this change we have updated related APIs to use a standard PEM file for certificates and keys. Note: Existing code that uses TLS/SSH on the Dart VM will have to be updated to use the new APIs, as described in TLS/SSL with Dart.

And more...


The SDK changelog has details about all of the updates in Dart 1.13. Get it now.

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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…