Skip to main content

Dart Editor Gets Smarter Code Completion

The new Dart Editor build contains fixes for the Clean Up wizard, capturing screenshots for feedback, and even runs 'pub install' whenever pubspec.yaml file changes.

One of our favorite new features is the better type inference. The new build can recommend a union of declared and checked types for code completion. The screenshot below shows an example:


Notice how, inside of the if block, the editor presents options for warrior containing both the methods in Warrior as well as Ninja.



Eric Clayberg writes about the full list of changes in this build:

  • New migration Clean Up - convert interface to abstract class with redirecting factory constructors.

  • New option to capture and send a screenshot during feedback (Windows and Linux only for now).
  • Performance optimizations for saving and analysis; saving and associated analysis is now 60% faster.
  • Rename refactoring improvements - link constructor names and rename closure parameters.

  • Better error messages and Quick Fixes for deprecated getter syntax and missing “part of” directive.

  • Better type inference - use union of declared and checked types; search members in inferred type subtypes.
  • Semantic highlighting improvements.
  • Pub install is now run automatically on changes to pubspec
  • Files View SDK node now shows just the libraries and no packages.
  • Fix to remove stale contents from the index and analysis cache.
  • Fix to make the Eclipse Dart nature play nice with other non-Dart natures (such as JS, Java, C, etc).
  • Fix for a crashing bug in Dartium.
  • Fix for an issue running the Dart VM on Windows.
Breaking Change List:
  • Some HTML constructors changed to named parameters
  • NotImplementedException is UnimplementedError
  • IndexOfOutRangeException is now RangeError
  • 'part of' is now required, breaking change coming
  • noSuchMethod now follows spec.
  • Unittest expect() uses new argument syntax
And as always, view the changelog for the full list of changes, and to get started with the Editor see our tutorial.

Comments

  1. For all you Lithuanians over here: http://naujienos.dartlang.lt/2012/11/dart-editor-igauna-protingesni-kodo.html

    ReplyDelete

Post a Comment

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…

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…

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…