## What is graphology?

Graphology is a robust and versatile JavaScript library for creating, manipulating, and analyzing graphs. It provides a comprehensive set of tools for working with both directed and undirected graphs, and supports various graph algorithms and data structures.

## What are graphology's main functionalities?

Graph Creation

This feature allows you to create a new graph, add nodes, and add edges between nodes. The code sample demonstrates creating a graph, adding two nodes ('John' and 'Jane'), and adding an edge between them.

```
const Graph = require('graphology');
const graph = new Graph();
graph.addNode('John');
graph.addNode('Jane');
graph.addEdge('John', 'Jane');
console.log(graph.nodes()); // ['John', 'Jane']
console.log(graph.edges()); // [{ source: 'John', target: 'Jane' }]
```

Graph Algorithms

Graphology supports various graph algorithms, such as Dijkstra's shortest path algorithm. The code sample demonstrates creating a graph with weighted edges and finding the shortest path from node 'A' to node 'C'.

```
const Graph = require('graphology');
const { dijkstra } = require('graphology-shortest-path');
const graph = new Graph();
graph.addNode('A');
graph.addNode('B');
graph.addNode('C');
graph.addEdge('A', 'B', { weight: 1 });
graph.addEdge('B', 'C', { weight: 2 });
graph.addEdge('A', 'C', { weight: 4 });
const path = dijkstra(graph, 'A', 'C');
console.log(path); // ['A', 'B', 'C']
```

Graph Analysis

Graphology provides tools for analyzing graphs, such as calculating centrality metrics. The code sample demonstrates creating a graph and calculating the degree centrality of each node.

```
const Graph = require('graphology');
const { degreeCentrality } = require('graphology-metrics/centrality');
const graph = new Graph();
graph.addNode('A');
graph.addNode('B');
graph.addNode('C');
graph.addEdge('A', 'B');
graph.addEdge('B', 'C');
graph.addEdge('A', 'C');
const centrality = degreeCentrality(graph);
console.log(centrality); // { A: 2, B: 2, C: 2 }
```

## Other packages similar to graphology

### cytoscape

Cytoscape.js is a graph theory library for visualization and analysis. It is highly optimized for large graphs and provides a rich set of features for graph manipulation and visualization. Compared to Graphology, Cytoscape.js is more focused on visualization and interactive graph exploration.

### vis-network

vis-network is a dynamic, browser-based visualization library for network graphs. It allows for interactive exploration and manipulation of graphs. While Graphology focuses on graph data structures and algorithms, vis-network emphasizes visualization and user interaction.

### sigma

Sigma is a JavaScript library dedicated to graph drawing. It provides a simple way to visualize graphs and supports various layout algorithms. Sigma is more focused on rendering and visualizing graphs, whereas Graphology provides a more comprehensive set of tools for graph manipulation and analysis.

## Graphology

`graphology`

is a specification for a robust & multipurpose JavaScript `Graph`

object and aiming at supporting various kinds of graphs under a same unified interface.

You will also find here the source for the reference implementation of this specification.

### Documentation

Full documentation for the library/specs is available here.