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

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+# `crossJoin()`
+
+The crossJoin method cross joins the collection with the given array or collection, returning all possible permutations:
+
+```js
+const collection = collect([1, 2]);
+
+const joined = collection.crossJoin(['a', 'b']);
+
+joined.all();
+
+// [
+//   [1, 'a'],
+//   [1, 'b'],
+//   [2, 'a'],
+//   [2, 'b'],
+// ]
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/crossJoin.js)