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# Strain Implement the `keep` and `discard` operation on collections. Given a collection and a predicate on the collection's elements, `keep` returns a new collection containing those elements where the predicate is true, while `discard` returns a new collection containing those elements where the predicate is false. For example, given the collection of numbers: - 1, 2, 3, 4, 5 And the predicate: - is the number even? Then your keep operation should produce: - 2, 4 While your discard operation should produce: - 1, 3, 5 Note that the union of keep and discard is all the elements. The functions may be called `keep` and `discard`, or they may need different names in order to not clash with existing functions or concepts in your language. ## Restrictions Keep your hands off that filter/reject/whatchamacallit functionality provided by your standard library! Solve this one yourself using other basic tools instead. * * * * For installation and learning resources, refer to the [exercism help page][]. [exercism help page]: http://exercism.io/languages/lfe To run the provided tests, you will need `make`. Open a terminal window and run the following from the exercise directory: ```sh make test ``` You should now be able to see the results of the test suite for the exercise. ## Source Conversation with James Edward Gray II [https://twitter.com/jeg2](https://twitter.com/jeg2) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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