Reduce a multi-dimensional array into a smaller multi-dimensional array

Question

I wanted to reduce a multi-dimensional array into a smaller multi-dimensional array. Let me post what I mean. Here is my input/starting array:

[
  [
    [ ["Armando", "P"], ["Dave", "S"] ],
    [ ["Richard", "R"],  ["Michael", "S"] ],
  ],
  [
    [ ["Allen", "S"], ["Omer", "P"] ],
    [ ["David E.", "R"], ["Richard X.", "P"] ]
  ]
]

And I think this is the four dimensional array which I want to reduce to:

["Armando", "P"], ["Dave", "S"], ["Richard", "R"],  ["Michael", "S"], ["Allen", "S"],["Omer", "P"] , ["David E.", "R"], ["Richard X.", "P"]

How can I do this in Ruby?

You can just loop through all these levels and build your result. Have you tried that? :) — Sergio Tulentsev
– Sergio Tulentsev, Commented Oct 21, 2012 at 10:37

tokland · Accepted Answer · 2012-10-21 10:49:16Z

3

Use Array#flatten(levels):

xs.flatten(2)

edited Oct 21, 2012 at 10:49

answered Oct 21, 2012 at 10:38

tokland

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5 Comments

OneMoreError Over a year ago

@tokland: This returns => ["Armando", "P", "Dave", "S", "Richard", "R", "Michael", "S", "Allen", "S", " Omer", "P", "David E.", "R", "Richard X.", "P"]

OneMoreError Over a year ago

I want to maintain the last level !!

tokland Over a year ago

@CSSS: are you sure? I just tested it in a console, taking the array verbatim from your question, you need two flattenings. Anyway, check flatten(1).

OneMoreError Over a year ago

Still there is some level of nesting that remains

OneMoreError Over a year ago

Sorry.. my fault. Your solution is perfect !

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