Provides numerous graph theory based Graph Collections

pub MIT

Graph theory

Graph theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of vertices (also called nodes or points) which are connected by edges (also called links or lines).

Undirected Directed

Undirected Graph

All edges of the undirected graph are bidirectional

Directed Graph

All edges of the directed graph are directed from one vertex to another

Union of directed graphs and undirected graphs
This means that only edge relationships can be stored and values cannot be stored.


A multigraph (in contrast to a simple graph) is a graph which is permitted to have multiple edges (also called parallel edges1), that is, edges that have the same end nodes. Thus two vertices may be connected by more than one edge.

The base implementation of this library is part of the multigraph
It allows each key to produce an edge, but does not allow 2 key equal edges
Each key can represent an edge between two nodes that store values
It is like allowing red and blue edges to exist together but not allowing 2 red or 2 blue

Undirected Value Graph

An undirected graph of values can be set

Directed Value Graph

An directed graph of values can be set


Union of directed graphs, undirected graphs, directed value graphs, undirected value graphs

API reference

API reference


import 'package:graph_collection/graph.dart';

void main() {
  final g = Graph();

  // Base

  // Undirected Graph, 2);
  g.hasLink(1, 2);
  g.unLink(1, 2);

  // Directed Graph
  g.linkTo(1, 2);
  g.hasLinkTo(1, 2);
  g.unLinkTo(1, 2);

  // Undirected value Graph
  g.set(1, 2, 3, 4);
  g.hasEdge(1, 2, 3);
  g.get(1, 2, 3);
  g.tryGet(1, 2, 3);
  g.unSet(1, 2, 3);

  g.setBy<int>(1, 2, 3);
  g.hasEdgeBy<int>(1, 2);
  g.getBy<int>(1, 2);
  g.tryGetBy<int>(1, 2);
  g.unSetBy<int>(1, 2);

  // Directed value Graph
  g.setTo(1, 2, 3, 4);
  g.hasEdgeTo(1, 2, 3);
  g.get(1, 2, 3);
  g.tryGet(1, 2, 3);
  g.unSetTo(1, 2, 3);

  g.setToBy<int>(1, 2, 3);
  g.hasEdgeToBy<int>(1, 2);
  g.getBy<int>(1, 2);
  g.tryGetBy<int>(1, 2);
  g.unSetToBy<int>(1, 2);