CODE EXAMPLE FOR JAVASCRIPT

JS DFS

class Graph {
    constructor() {
        this.vertices = [];
        this.adjacent = {};
        this.edges = 0;
    }

    addVertex(v) {
        this.vertices.push(v);
        this.adjacent[v] = [];
    }

    addEdge(v, w) {
        this.adjacent[v].push(w);
        this.adjacent[w].push(v);
        this.edges++;
    }


    bfs(goal, root = this.vertices[0]) {
        let adj = this.adjacent;

        const queue = [];
        queue.push(root);

        const discovered = [];
        discovered[root] = true;

        const edges = [];
        edges[root] = 0;

        const predecessors = [];
        predecessors[root] = null;

        const buildPath = (goal, root, predecessors) => {
            const stack = [];
            stack.push(goal);

            let u = predecessors[goal];

            while(u != root) {
                stack.push(u);
                u = predecessors[u];
            }

            stack.push(root);

            let path = stack.reverse().join('-');

            return path;
        }
    

        while(queue.length) {
            let v = queue.shift();

            if (v === goal) {
                return { 
                    distance: edges[goal],
                    path: buildPath(goal, root, predecessors)
                };
            }

            for (let i = 0; i < adj[v].length; i++) {
                if (!discovered[adj[v][i]]) {
                    discovered[adj[v][i]] = true;
                    queue.push(adj[v][i]);
                    edges[adj[v][i]] = edges[v] + 1;
                    predecessors[adj[v][i]] = v;
                }
            }
        }

        return false;
    }

    dfs(goal, v = this.vertices[0], discovered = []) {
        let adj = this.adjacent;

        discovered[v] = true;

        for (let i = 0; i < adj[v].length; i++){
            let w = adj[v][i];

            if (!discovered[w]) {
                this.dfs(goal, w, discovered);
            }
        }

        return discovered[goal] || false;
    }
}