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

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+# `unless()`
+
+The unless method will execute the given callback when the first argument given to the method evaluates to false:
+
+```js
+const collection = collect([1, 2, 3]);
+
+collection.unless(false, items => items.push(4));
+
+collection.all();
+
+// [1, 2, 3, 4]
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/unless.js)