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

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+# `mergeRecursive()`
+
+The mergeRecursive method merges the given array or collection recursively with the original collection. If a string key in the given items matches a string key in the original collection, then the values for these keys are merged together into an array, and this is done recursively:
+
+```js
+const collection = collect({
+  product_id: 1,
+  price: 100,
+});
+
+const merged = collection.mergeRecursive({
+  product_id: 2,
+  price: 200,
+  discount: false,
+});
+
+merged.all();
+
+// {
+//   product_id: [1, 2],
+//   price: [100, 200],
+//   discount: false,
+// }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/mergeRecursive.js)