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

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+# `macro()`
+
+The macro method lets you register custom methods
+
+```js
+collect().macro('uppercase', function () {
+  return this.map(item => item.toUpperCase());
+});
+
+const collection = collect(['a', 'b', 'c']);
+
+collection.uppercase();
+
+collection.all();
+
+// ['A', 'B', 'C']
+```
+
+> Note that the `macro` method returns `undefined`, and therefore it is not possible to use it within a chain of methods.
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/macro.js)