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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. ## Setup Go through the setup instructions for JavaScript to install the necessary dependencies: http://exercism.io/languages/javascript/installation ## Running the test suite The provided test suite uses [Jasmine](https://jasmine.github.io/). You can install it by opening a terminal window and running the following command: ```sh npm install -g jasmine ``` Run the test suite from the exercise directory with: ```sh jasmine strain.spec.js ``` In many test suites all but the first test have been marked "pending". Once you get a test passing, activate the next one by changing `xit` to `it`. ## 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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84 entries across 84 versions & 1 rubygems