[dart2wasm] Avoid using deep array copy in places where we only want to copy shallow The `jsArrayFromDartList` method is a deep array copy: It will call out to JS to allocate an array and initialize it by calling back to Dart for each dart list element and `jsify()` each element (which may - if the element is a list - call `jsArrayFromDartList` again). For the use cases changed in this CL we know we have a `List<JSAny>` so there's actually no reason to do this recursively, we only need to allocate a JS array and fill in the elements from the dart list (without any processing such as `jsify(0)`ing the elements). We also add some fast cases to `List<JSAny?>.toJS` for length=0/1/2/3 Change-Id: Idf82e104a743b883c8af0bd1b3b3234dff6e3d5b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/414780 Reviewed-by: Srujan Gaddam <srujzs@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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.
Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Visit dart.dev to learn more about the language, tools, and to find codelabs.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
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If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
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You can also contribute patches, as described in Contributing.
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