# # `mapToDictionary()`

Run a dictionary map over the items. The callback should return an associative array with a single key/value pair.

    const collection = collect([
      { id: 1, name: "a" },
      { id: 2, name: "b" },
      { id: 3, name: "c" },
      { id: 4, name: "b" }
    ]);

    const groups = collection.mapToDictionary(item => [item.name, item.id]);

    groups.all();

    //=> {
    //=>   a: [1],
    //=>   b: [2, 4],
    //=>   c: [3],
    //=> }

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