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app/code/node_modules/collect.js/docs/api/mapToDictionary.md

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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)