How to combine array of hashes into one array?

Question

I'm trying to combine an array of hashes like this:

[{:locale=>:"en-US", :key=>:key1}, 
 {:locale=>:"en-US", :key=>:key2}, 
 {:locale=>:da,      :key=>:key1}]

Into one array like this:

['locale', 'en-US', 'key', 'key1', 
 'locale', 'en-US', 'key', 'key2', 
 'locale', 'da',    'key', 'key1']

How can I do this?

please make an attempt before asking for help

depperm
– depperm

2021-10-04 12:57:52 +00:00
Commented Oct 4, 2021 at 12:57 — depperm
– depperm, Commented Oct 4, 2021 at 12:57

Rajagopalan · Accepted Answer · 2021-10-04 13:01:25Z

4

Input

a=[{:locale=>:"en-US", :key=>:key1}, {:locale=>:"en-US", :key=>:key2}, {:locale=>:da, :key=>:key1}]

Code

result=a.map do |h|
  h.map do|k,v|
    [k,v]
  end
end.flatten
p result

Or

p a.flat_map(&:to_a).flatten

Output

[:locale, :"en-US", :key, :key1, :locale, :"en-US", :key, :key2, :locale, :da, :key, :key1]

answered Oct 4, 2021 at 13:01

Rajagopalan

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3 Comments

engineersmnky Over a year ago

Another option a.flat_map(&:flatten)

steenslag Over a year ago

@rajagopalan Just map (no flat_map) is fine too.

Cary Swoveland Over a year ago

Note that the OP wishes to construct an array of strings.

Jurr · Accepted Answer · 2021-10-04 19:28:01Z

0

Or, even quicker and easier:

array = [{:locale=>:"en-US", :key=>:key1}, {:locale=>:"en-US", :key=>:key2}, {:locale=>:da, :key=>:key1}]
array.map { |hash| [hash.keys, hash.values] }.flatten

answered Oct 4, 2021 at 19:28

Jurr

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