Method getEdgeByIndex

src/data/Graph.ts:153–156

* Get edge by data index

(dataIndex: number)

     * Get edge by data index
     */
    getEdgeByIndex(dataIndex: number): GraphEdge {
        const rawIdx = this.edgeData.getRawIndex(dataIndex);
        return this.edges[rawIdx];
    };
    /**
     * Get edge by two linked nodes
     */