Function getOrCreate

getOrCreate(graph, id): Readonly<{
    graph: Readonly<{
        edges: readonly Readonly<{
            a: string;
            b: string;
            weight?: number;
        }>[];
        vertices: IMapImmutable<string, Readonly<{
            id: string;
        }>>;
    }>;
    vertex: Readonly<{
        id: string;
    }>;
}>
Parameters
- graph: Readonly<{
      edges: readonly Readonly<{
          a: string;
          b: string;
          weight?: number;
      }>[];
      vertices: IMapImmutable<string, Readonly<{
          id: string;
      }>>;
  }>
- id: string
Returns Readonly<{
    graph: Readonly<{
        edges: readonly Readonly<{
            a: string;
            b: string;
            weight?: number;
        }>[];
        vertices: IMapImmutable<string, Readonly<{
            id: string;
        }>>;
    }>;
    vertex: Readonly<{
        id: string;
    }>;
}>