May be useful to convert Newspeak to Javascript

Difficulties in Systems design: A complex system that works is invariably found to have evolved from a simple system that worked. A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over with a working simple system.

Reference on all patterns in the book

app showing off Flutter Design Patterns

Good blog on Flutter. Among others, good series on design patterns.

Series of design patterns in Flutter and Dart

An object is a first-class, dynamically dispatched behavior.

Core site for Material design documentation

Dasign pattern for two similar 'parallel' hierarchies