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

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+# `union()`
+
+The union method adds the given array to the collection. If the given array contains keys that are already in the original collection, the original collection's values will be preferred:
+
+```js
+const collection = collect({
+  a: 'A',
+  b: 'B',
+});
+
+const union = collection.union({
+  a: 'AAA',
+  c: 'CCC',
+  b: 'BBB',
+});
+
+union.all();
+
+// {
+//   a: 'A',
+//   b: 'B',
+//   c: 'CCC',
+// }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/union.js)