Make flatten deep flatten

[silvestertomato]

Right now:

const array = [1, 2, [3, 4, [5, 6], 7], 8]
flatten(array) // [1, 2, 3, 4, [5, 6], 7, 8]

What I want

const array = [1, 2, [3, 4, [5, 6], 7], 8]
flatten(array) // [1, 2, 3, 4, 5, 6, 7, 8]

[Shenseye]

Add a test for this. #12

[kentcdodds]

Fantastic! For some reason I thought this would be a breaking change. Didn't realize it was already supported. Thanks for the test!

[diwesh87]

Hi, I am trying to go through your course "How to contribute to an Open Source Project on Github" . I would like to add the function to "find duplicates items in an array". The original solution is here at Find duplicate items in an array

[kentcdodds]

Cool could you create a new issue for this? I like this answer a lot personally :-) http://stackoverflow.com/a/24968449/971592
Once you have the new issue created, please feel free to get started!