# 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]

Do not use scala built-in `flatten` function.

## Submitting Exercises

Note that, when trying to submit an exercise, make sure the solution is in the `exercism/scala/<exerciseName>` directory.

For example, if you're submitting `FlattenArray.scala` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/src/main/scala/FlattenArray.scala`.

For more detailed information about running tests, code style and linting,
please see the [help page](http://exercism.io/languages/scala).

## 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.