How to add subarrays to itself? Ruby

Question

I have an array containing of subarrays like this:

arr = [[{"big" => "2055", "small" => -"-10", "thin" => "i"},
        {"big" => "2785", "small" => "0", "thin" => "l"}], 
       [{"big" => "7890", "small" => "3", "thin" => "t"},
        {"big" => "2669", "small" => "0,5", "thin" => "f"},
        {"big" => "9000", "small" => "2", "fat" => "O"}]]

I want to add subarrays to itself to get an array like this:

arr = [{"big" => "2055", "small" => "-10", "thin" => "i"},
       {"big" => "2785", "small" => "0", "thin" => "l"},
       {"big" => "7890", "small" => "3", "thin" => "t"},
       {"big" => "2669", "small" => "0,5", "thin" => "f"},
       {"big" => "9000", "small" => "2", "fat" => "O"}]

Doing like this:

arr.map! {|x| x+x}

I get added subarrays but every hash appears twice. How to do it right?

score 0 · Answer 1 · answered Jul 05 '17 at 13:01

0

Do you just want to flatten the array?

arr.flatten

It concatenates every sub-array into one big array, recursively if needed.

[[1,2], [3,4]].flatten
# => [1, 2, 3, 4]

If you want to modify the array in place, you can use :

arr.flatten!

It doesn't matter what the inner-elements look like (integers, strings, hashes), as long as they're not arrays, they won't be touched by flatten.

answered Jul 05 '17 at 13:01

Eric Duminil

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And even if they are arrays, `flatten` accepts a `level` parameter :) `[[1,[2]],[3,[4]]].flatten(1) #⇒ [1, [2], 3, [4]]`. – Aleksei Matiushkin Jul 05 '17 at 13:18
@mudasobwa: True, but I should have just closed the question instead of answering it. – Eric Duminil Jul 05 '17 at 13:48

score 0 · Answer 2 · answered Jul 05 '17 at 13:01

0

Ruby have a built in method try use Array.flatten

answered Jul 05 '17 at 13:01

Chen Kinnrot

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score 0 · Answer 3 · answered Jul 05 '17 at 13:01

You can use flatten!:

arr.flatten!

#=> [{"big"=>"2055", "small"=>"-10", "thin"=>"i"},
     {"big"=>"2785", "small"=>"0", "thin"=>"l"},
     {"big"=>"7890", "small"=>"3", "thin"=>"t"},
     {"big"=>"2669", "small"=>"0,5", "thin"=>"f"},
     {"big"=>"9000", "small"=>"2", "fat"=>"O"}]

score 0 · Answer 4 · answered Jul 05 '17 at 13:01

0

You can try this

arr = arr.flatten

answered Jul 05 '17 at 13:01

Son Nguyen

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How to add subarrays to itself? Ruby

4 Answers4