UndirectedJS

JavaScript implementation of undirected graphs through adjacency lists

This package is mainly a refined and robust implementation with types of:

https://www.geeksforgeeks.org/implementation-graph-javascript/

It is meant to provide an easy and accessible ("out-of-the-box") work flow and to be minimal.

While there is an array of existing solutions for the given task, they all seem to "fail" for specific reasons - considering the targeted usage paradigm:

• graphology as a whole specification is over scoped.
• graphlib as a complete solution for either directed and undirected graphs with tons of admittedly elaborate features is far away from being minimal.
• Then there are a few packages who look not taken care of a lot and/or abandoned: graphlibrary (a fork from graphlib), undirected-graph, graph.

Usage

import Undirected from 'undirected';

const graph = new Undirected();

// Or just
// const graph = new Undirected(people, friendship);
// whilst defining `people` and `friendship` upfront

const people = ['Alice', 'Bob', 'John', 'Jane'];

const friendship = [
  ['Alice', 'Bob'],
  ['Bob', 'John'],
  ['John', 'Alice'],
  ['Jane', 'John'],
  ['Jane', 'Alice'],
];

// Add bundled data
graph.addNodes(people);
graph.addEdges(friendship);

// Add single data points with the same methods
graph.addNodes('Solomon');
graph.addEdges(['Solomon', 'Bob']);

// Perform lookups
console.log(graph.bfs('Alice', 'Jane'));
console.log(graph.dfs('Alice', 'Solomon'));

// Remove nodes or connections
graph.removeNodes('John');
graph.removeEdges(['Jane', 'Alice']);

console.log(graph);

API

Constructor: new Undirected(nodes?: Nodes, edges?: Edges)

Creates a new instance of an undirected graph from the given nodes and edges. Both can be given as implicit singletons (a single string for a node or an array of two strings for an edge) or an array of strings for the nodes or a list of arrays for the edges. Specifically, the edges are passed as a list of connections beetwen any two edges, i.e. ['nodeA', 'nodeB'] (or [['node1', 'node2'], ...]).

Properties

.graph

Returns the (current) Map representation of the undirected graph, i.e. the adjacency list.

Methods

addNodes

▸ addNodes(keys: Nodes)

Add a node or a set of nodes to the graph.

addEdges

▸ addEdges(pairs: Edges)

Add an edge or a set of edges to the graph.

bfs

▸ bfs(search: string, start: string, callback?: LookupCallback): LookupResult

Performs a breadth-first search. If the lookup is successful, the callback is invoked with the search and path length (from start to search) and an array containing the path length and the path is returned. Otherwise the method returns undefined.

dfs

▸ dfs(search: string, start: string, callback?: LookupCallback): LookupResult

Performs a depth-first search. If the lookup is successful, the callback is invoked with the search and path length (from start to search) and an array containing the path length and the path is returned. Otherwise the method returns undefined.

Keywords

• undirected
• graphs
• graph
• theory
• network
• path
• algorithm
• data
• structures

Dependencies

• type-insurance

Related

• graphology - a specification for a robust & multipurpose JavaScript Graph object
• graphlib - Graphlib is a JavaScript library that provides data structures for undirected and directed multi-graphs
• graphlibrary - based on dagrejs/graphlib (see above)
• undirected-graph - Graph data structure with basic functionality
• graph - a simple Javascript library for manipulating directed and undirected graphs

Maintainer

• Ruben Giannotti - ruben.giannotti@gmx.net - github.com/giannotr