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

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+# `flatMap()`
+
+The flatMap method iterates through the collection and passes each value to the given callback. The callback is free to modify the item and return it, thus forming a new collection of modified items. Then, the array is flattened by a level:
+
+```js
+const collection = collect([
+  {
+    name: 'Sadio Mané',
+    number: 10,
+  },
+  {
+    name: 'Mohamed Salah',
+    number: 11,
+  },
+]);
+
+const flatMapped = collection.flatMap(value => value.name.toUpperCase());
+
+flatMapped.all();
+
+// ['SADIO MANÉ', 'MOHAMED SALAH']
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/flatMap.js)