A couple different ways of implementing graphs - Done in Dart
There are plenty of ways to represent graphs in code. They all have different advantages and disadvantages in handling node types, edge types, edge directionality, and edge data. I cover what I think are the three simplest models, Adjacency List, Edge List, and Adjacency Matrix. The video points to a repository where I (over) implemented graph representations in Dart for a programming challenge.
https://github.com/freemansoft/fs-dar... that I hope someday to get merged to dart-utils.