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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 9v00669b3ff1000000000303

Rearrange array to single level

The goal is to flatten the array into a single list and remove any empty elements.

Start file

[
    []  ,
    [''],
    ['0', '1', '2'],
    ['3', '4', '5'],
    ['6', '7'],
    ['8', '9'],
    ['']
]

End file

['', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '']

View Diff

1,9c1
< [
<     []  ,
<     [''],
<     ['0', '1', '2'],
<     ['3', '4', '5'],
<     ['6', '7'],
<     ['8', '9'],
<     ['']
< ]
---
> ['', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '']

Solutions by @OwariDa:

Created by: @maharba6 Tweet

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Solutions by @OwariDa: