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    This library contain an implementation of graph data structure with various method that can be useful in operations by graphs.

    Graphs can directed and undirected, weighted and unweighted. So we have 4 variations and this library can works with them.


    npm install graphs-all

    Getting Started

    Import the library

    var graphs = require("graphs-all");
    var g = graphs.UndirectedUnweightedGraph();
    g.addLink("A", "B");
    g.addLink("A", "C");
    g.addLink("B", "C");
    g.hasNode("C") // true 
    g.hasLink("B", "A") // true 
    g.removeLink("C", "A");
    g.connectedWith("B") // ["A", "B"] 

    Create a graph

    You can create four variations of graphs with shortcuts functions:

    var simpleGraph = graphs.UndirectedUnweightedGraph(), 
        directedGraph = graphs.DirectedUnweightedGraph(),
        weightedGraph = graph.UndirectedWeightedGraph(),
        complexGraph = graph.DirectedWeightedGraph();

    Or with Graph class:

    new Graph(isDirected, isWeighted)

    var simpleGraph = new graphs.Graph(false, false), 
        directedGraph = new graphs.Graph(true, false),
        weightedGraph = new graphs.Graph(false, true),
        complexGraph = new graphs.Graph(true, true);

    Add nodes


    Add a node in the graph with key nodeKey. If node is exist already, then return false, for successive addition returns true.

    simpleGraph.hasNode("B") // true 
    simpleGraph.hasNode("A") // false 

    Check nodes


    Check is a node with key nodekey in the graph

    simpleGraph.hasNode("A") // true 
    simpleGraph.hasNode("E") // false 

    Add links

    Graph.addLink(key1, key2)

    Graph.addLink(key1, key2, weight)

    Add a link between key1 and key2 nodes. If nodes are not existed, then they are created. For directed graphs, it's created a directed link from key1 to key2. For weighted graphs you can add the third argument weight (default == 1). weight must be a number.

    simpleGraph.addLink("A", "E");
    simpleGraph.hasNode("E"); // true 
    weightedGraph.addLink("E", "C", 5);

    Check links

    Graph.hasLink(key1, key2)

    Graph.linkWeight(key1, key2)

    Check the existence of the link between key1 and key2 nodes (the order is important only for directed graphs). It returns true if the link is exist, false otherwise.

    Also you can use linkWeight - it has the same interface and returns undefined if the link doesn't exist, otherwise the weight of the link (1 for unweighted graphs).

    simpleGraph.addLink("A", "E");
    simpleGraph.hasLink("E", "A"); // true 
    weightedGraph.addLink("E", "C", 5);
    weightedGraph.linkWeight("E", "C"); // 5 
    simpleGraph.linkWeight("Z", "A"); // undefined 

    Get node list


    Returns an array on node keys.

    simpleGraph.addLink(1, 2);
    simpleGraph.addLink(3, 4);
    simpleGraph.nodes(); // [1, 2, 3, 4] 

    Get node connections


    Returns an array of keys of nodes, which are connected with the given node. For directed graphs return only nodes that are available from from the given node.

    simpleGraph.addLink("A", "D");
    simpleGraph.addLink("A", "E");
    simpleGraph.addLink("C", "A");
    simpleGraph.nodeConnections("A"); // ["E", D", "C"] 
    directedGraph.addLink("A", "B");
    directedGraph.addLink("C", "A");
    directedGraph.nodeConnections("A"); // ["B"] 

    Remove Nodes


    Removes the node from the graph, also remove all connected links (input and output).

    directedGraph.addLink("1", "2");
    directedGraph.addLink("3", "1");
    directedGraph.addLink("1", "4");
    directedGraph.hasNode("1"); // false 
    directedGraph.hasLink("1", "2"); // false 
    directedGraph.hasLink("3", "1"); // false 

    Remove Links

    Graph.removeLink(key1, key2)

    Removes the link from the graph. The nodes are not removed, only the link. For directed graphs remove only one-way link from key1 to key2.

    simpleGraph.addLink("5", "6");
    simpleGraph.removeLink("6", "5");
    simpleGraph.hasLink("5", "6"); // false 
    simpleGraph.hasNode("5"); // true 


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