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Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/collect.js/docs/api/groupBy.md

@@ -0,0 +1,109 @@
+# `groupBy()`
+
+The groupBy method groups the collection's items into multiple collections by a given key:
+
+> If you want to group the collection by keys as a plain object, see [mapToGroups](mapToGroups)
+
+```js
+const collection = collect([
+  {
+    product: 'Chair',
+    manufacturer: 'IKEA',
+  },
+  {
+    product: 'Desk',
+    manufacturer: 'IKEA',
+  },
+  {
+    product: 'Chair',
+    manufacturer: 'Herman Miller',
+  },
+]);
+
+const grouped = collection.groupBy('manufacturer');
+
+grouped.all();
+
+// {
+//   IKEA: Collection {
+//     items: [
+//        {
+//          id: 100,
+//          product: 'Chair',
+//          manufacturer: 'IKEA',
+//          price: '1490 NOK',
+//        },
+//        {
+//          id: 150,
+//          product: 'Desk',
+//          manufacturer: 'IKEA',
+//          price: '900 NOK',
+//        },
+//      ],
+//   },
+//   'Herman Miller': Collection {
+//     items: [
+//       {
+//         id: 200,
+//         product: 'Chair',
+//         manufacturer: 'Herman Miller',
+//         price: '9990 NOK',
+//       },
+//     ],
+//   },
+// }
+```
+
+In addition to passing a string key, you may also pass a callback. The callback should return the value you wish to key the group by:
+
+```js
+const collection = collect([
+  {
+    product: 'Chair',
+    manufacturer: 'IKEA',
+  },
+  {
+    product: 'Desk',
+    manufacturer: 'IKEA',
+  },
+  {
+    product: 'Chair',
+    manufacturer: 'Herman Miller',
+  },
+]);
+
+const grouped = collection.groupBy((item, key) => item.manufacturer.substring(0, 3));
+
+grouped.all();
+
+// {
+//   IKE: Collection {
+//     items: [
+//       {
+//         id: 100,
+//         product: 'Chair',
+//         manufacturer: 'IKEA',
+//         price: '1490 NOK',
+//       },
+//       {
+//         id: 150,
+//         product: 'Desk',
+//         manufacturer: 'IKEA',
+//         price: '900 NOK',
+//       },
+//     ],
+//   },
+//   Her: Collection {
+//     items: [
+//       {
+//         id: 200,
+//         product: 'Chair',
+//         manufacturer: 'Herman Miller',
+//         price: '9990 NOK',
+//       },
+//     ],
+//   },
+// }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/groupBy.js)