Skip to main content

Release Notes for Dart's Beta Release

Today's release of the Dart SDK and Editor is the first beta release, and contains performance and productivity improvements across the platform. This latest release helps Dart developers automate code evolution, produce smaller JavaScript code and deploy Dart web apps.

The major additions and changes to the platform include:



  • dart2js
    • Added support for dart:typed_data
    • Improved type inferrer by using union types and keeping track of side effects
    • Implemented sharing of code mixed into multiple classes
    • More coverage for handling of generic type
    • Performance improvements
      • 20% faster on Richards, 10% faster on DeltaBlue, 8% faster on Tracer
    • Significant progress on mirrors support (work in progress)
  • Dart VM
    • DeltaBlue: 40% faster than M4
    • Tracer: 33% faster than M4
    • Full SIMD acceleration
    • Reduced initial snapshot size
      • improves startup time for new isolates
    • Improved stability of debugging experience
  • Editor
    • A new 20% faster Analyzer in Editor and SDK.
      • Remove old analyzer.
    • More quick fixes and refactorings in Editor.
    • Code Folding has returned with the new ability to collapse classes and local functions.
    • Mark Occurrences is back.
    • New Pub Deploy command.
    • Many Code Completion enhancements
      • Proposal filtering now accepts camelCase input (e.g., type 'i' then 'E' to filter out everything except isEmpty).
      • Unused optional parameters are deleted automatically after template editing is done.
      • Requesting completion in an empty argument list will include an option to insert the argument template.
      • The seed is now case-insensitive (e.g., map.isemp+Ctrl-Space -> map.isEmpty).
  • Greatly improved WebGL performance in Dartium because of move to dart:typed_data library for typed arrays.
  • Libraries
    • dart:async
      • Stream bugfixing (one breaking change: disallow re-subscribing to cancelled stream)
    • dart:core
      • Allow Pattern (like String and RegExp) in more places.
    • dart:uri
      • Functionality moved to dart:core, API improved, stable.
  • dart:crypto
    • Not essential to have as a dart: library at this point. Moved to a pub package.
  • dart:io
    • Added IPv6 support
    • Improved speed and stability of HTTP and Web Sockets. HTTP handing is now more than 50% faster
    • Better support for processing HTTP bodies
    • Improved HTTP authentication and proxy support
  • pub:
    • New backtracking version solver, SDK version constraints
    • Add offline mode
    • Initial version of pub deploy
  • html:
    • New dart:mdv_observe library
    • Typed_data
  • dartium: devtools improvements
    • Repl-style behavior including creating new Dart objects from the console
    • Mouse over of Dart fields and getters now displays their values
    • Fewer crashes
  • Web UI
    • New polymer branch, implementing Web UI with Polymer polyfills (work in progress)

    You can download the latest version of Dart Editor, including everything you need for Dart development, from dartlang.org. We look forward to your feedback!

    Comments

    Popular posts from this blog

    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…

    Dart 1.12 Released, with Null-Aware Operators and more

    Dart 1.12.0 is now released! It contains the new null-aware operators language feature, and enhancements to pub, Observatory, dartdoc, and much more.

    Null-aware operators

    The new null-aware operators help you reduce the amount of code required to work with references that are potentially null. This feature is a collection of syntactic sugar for traversing (potentially null) object calls, conditionally setting a variable, and evaluating two (potentially null) expressions.

    Click or tap the red Run button below to see them in action.

    ??

      if null operator. `expr1 ?? expr2` evaluates to `expr1` if not `null`, otherwise `expr2`.


    ??=

      null-aware assignment. `v ??= expr` causes `v` to be assigned `expr` only if `v` is `null`.

    x?.p

      null-aware access. `x?.p` evaluates to `x.p` if `x` is not `null`, otherwise evaluates to `null`.

    x?.m()

      null-aware method invocation. `x?.m()` invokes `m` only if `x` is not `null`.

    Learn more about Dart's null-aware operators in our Language Tour.

    .packages fi…

    The new AdWords UI uses Dart — we asked why

    Google just announced a re-designed AdWords experience. In case you’re not familiar with AdWords: businesses use it to advertise on google.com and partner websites. Advertising makes up majority of Google’s revenue, so when Google decides to completely redo the customer-facing front end to it, it’s a big deal. The Dart team is proud to say that this new front end is built with Dart and Angular 2. Whenever you asked us whether Google is ‘even using Dart for anything,’ this is what we had in mind but couldn’t say aloud. Until now. We asked Joshy Joseph, the primary technical lead on the project, some questions. Joshy is focusing on things like infrastructure, application latency and development velocity, so he’s the right person to ask about Dart.Q: What exactly did we launch on Monday?It’s a complete redesign of the AdWords customer experience that is rolling out slowly as a test to a small initial set of advertisers. The most noticeable thing is probably the Material Design look and f…