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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)