QC Flutter: 10/21/2020

Community Updates

• Flutter Vikings Conference
• Joint December Meetup
• Flutter 1.22 announcement

Tonight's topic

Refactoring Excuses with Commands + GetIt

What is a command?

• A behavioral design pattern
• Include everything needed to perform a deferred action
• Encapsulated in an object instance with a run/execute call.

Benefits of commands

• Decouple invocation from execution
• Simplifies responsibilities
• Easy to extend
• Easier to test

Anatomy

Anatomy in Flutter

• Widget is the invoker
• Repository & Blocs are receivers

Show me the code

Prior art

The Command Design Pattern

Design Patterns in Swift

Practical Uses of Design Patterns in iOS Development: Command Pattern

Flutter: State Management using MVC+S Architecture