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# Flatten Array Take a nested list and return a single flattened list with all values except nil/null. The challenge is to write a function that accepts an arbitrarily-deep nested list-like structure and returns a flattened structure without any nil/null values. For Example input: [1,[2,3,null,4],[null],5] output: [1,2,3,4,5] * * * * To run the code in this exercise, you will only need to have [CommandBox CLI installed](https://ortus.gitbooks.io/commandbox-documentation/content/setup/installation.html). This binary runs CFML code from the command line. To run the tests, `cd` into the exercise folder and run the following: ```bash box task run TestRunner # Or start up a test watcher that will rerun when files change box task run TestRunner --:watcher ``` The tests leverage a library called TestBox which supports xUnit and BDD style of testing. All test suites will be written in the [BDD style](https://testbox.ortusbooks.com/content/primers/bdd/specs.html) which uses closures to define test specs. You won't need to worry about installing TestBox. The CLI test runner will take care of that for you. You just need to be connected to the internet the first time you run it. You can read more about it here: [https://testbox.ortusbooks.com/content/](https://testbox.ortusbooks.com/content/) ## Source Interview Question [https://reference.wolfram.com/language/ref/Flatten.html](https://reference.wolfram.com/language/ref/Flatten.html) ## 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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59 entries across 59 versions & 1 rubygems