Ruby 2D array to array of hashes with keys from different array

Question

In Ruby, what's most efficient way of converting a 2D array of values to an array of hashes, where the keys are taken from a separate array?

For example, from:

keys = ['First name', 'Last name', 'Phone number']
values = [['John', 'Smith', '555-1234'], ['Peter', 'Jones', '555-5678']]

To:

[
  {'First name' => 'John',
   'Last name' => 'Smith',
   'Phone number' => '555-1234'},
  {'First name' => 'Peter',
   'Last name' => 'Jones',
   'Phone number' => '555-5678'}
]

Arup Rakshit · Accepted Answer · 2014-07-07 10:17:54Z

3

You can do

array_of_hashs = values.map do |ary|
   keys.zip(ary).to_h
end

array_of_hashs
# => [{"First name"=>"John", "Last name"=>"Smith", "Phone number"=>"555-1234"}, 
# {"First name"=>"Peter", "Last name"=>"Jones", "Phone number"=>"555-5678"}]

answered Jul 7, 2014 at 10:17

Arup Rakshit

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1 Comment

Alex Over a year ago

Thanks! In Ruby 2.0 I had to change keys.zip(ary).to_h to Hash[keys.zip(ary)].

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