Dart 2.17 - What's New

New features of Dart Language version 2.17 including new language features: enums with member support, improved parameter forwarding to super classes, and more flexibility for named parameters.

Transcript

1. Dart 2.17 - What’s New Danvick Miller @danvickmiller CTO – Infinitysoft Tech
2. Intro š Theme: productivity and platform portability š New language features for improved productivity š Productivity tools š Broadening platform integration and support
3. New language features for productivity š Enhanced enums with members š Super initializers š Named arguments anywhere
4. Enhanced enums with members š Enums represent a discrete set of states. - enum Grade { a, b, c, d, e} š Pre 2.17, extensions could be used to add methods š When using extensions you MUST keep them in sync with the enum š Enum members can be: š Fields holding state š Constructors that set that state š Methods with functionality š Override existing members.
5. Enum with extensions – Old way “Talk is cheap. Show me the code.” ― Linus Torvalds
6. Enum with members – New way “Show me another demo, I dare ya!” - You
7. Super initializers š Inheritance hierarchy – pass some constructor parameters to the constructor of the superclass š Old way – leads to a lot of boilerplate code 1. List each parameter in child constructor 2. Invoke the super constructor – passing parameters to it
8. Super initializers: Sample
9. Named arguments anywhere
10. Productivity tools š Upgrades to package:lints – 10 new Dart rules, 2 new Flutter rules š Easier to debug Secure Sockets - TCP sockets secured with TLS and SSL. š Added rich samples code to core library API documentation š Removed deprecated code in dart:io – run dart fix š Deprecated CLI tool like pub – use dart pub or flutter pub š Removed deprecated CLI tool dartdoc – use dart doc
11. Broadening platform integration & support š Added Dart FFI plugin template - flutter create --template=plugin_ffi hello š FFI now supports ABI-specific data types – e.g. Long for both 32-bit and 64-bit architectures š Improved cleanup code in both native and Dart code in Dart FFI š Support for signing executables - enable deployment on Windows and macOS š Added support for RISC-V instruction set
12. Danvick Miller @danvickmiller github.com/danvick About Me • CTO - Infinitysoft • Organizer - Flutter (Devs) Kenya • Organizer - Droidcon Kenya (DroidconKe) • Contributions - Packages • flutter_form_builder • form_builder_validators • flutter_chips_input