Function buildGraph

javascript/0332-reconstruct-itinerary.js:36–45

(tickets, graph = new Map())

};

const buildGraph = (tickets, graph = new Map()) => {
    for (const [src, dst] of tickets) {
        const edges = graph.get(src) || [];

        edges.push(dst);
        graph.set(src, edges);
    }

    return graph;
};