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Dart type inference does not propagate type sideways in the argument lists[1], so we have to explicitly provide fold with a type argument, otherwise it is inferred as `Object?`, which does not work in this case. [1] https://github.com/dart-lang/language/issues/731 Change-Id: I2ee0bda2cd6c37c64018efd48ea14c469f76ba3a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152003 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com> |
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Dart
A client-optimized language for fast apps on any platform
Dart is:
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Optimized for UI: Develop with a programming language specialized around the needs of user interface creation
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app
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Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
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Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
License & patents
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Using Dart
Visit the dart.dev to learn more about the language, tools, getting started, and more.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Building Dart
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents on our wiki.
Contributing to Dart
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.