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# `mapToDictionary()`
Run a dictionary map over the items.
The callback should return an associative array with a single key/value pair.
```js
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],
// }
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/mapToDictionary.js)