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  1. # `when()`
  2. The when method will execute the given callback when the first argument given to the method evaluates to true:
  3. ```js
  4. const collection = collect([1, 2, 3]);
  5. collection.when(true, items => items.push(4));
  6. collection.all();
  7. // [1, 2, 3, 4]
  8. ```
  9. [View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/when.js)