Ruby - Convert Hash with array values to array of hashes

Question

Let's say I have this hash:

def aliases
  {
    blond: [
      'dark blond',
      'dirty blond',
      'honey blond',
      'sandy blond',
      'stawberry blond'
    ],
    brown: [
      'dark brown',
      'light brown'
    ],
    gray: [
      'grey'
    ]
  }
end

What is the most elegant way to convert it to:

[ { blond: 'dark blond' }, { blond: 'dirty blond' }, { brown: 'dark brown' } ... ]

Cary Swoveland · Accepted Answer · 2019-05-21 00:12:28Z

3

aliases.flat_map { |k,v| v.map { |s| { k=>s } } }
  #=> [{:blond=>"dark blond"}, {:blond=>"dirty blond"}, {:blond=>"honey blond"},
  #    {:blond=>"sandy blond"}, {:blond=>"stawberry blond"}, {:brown=>"dark brown"},
  #    {:brown=>"light brown"}, {:gray=>"grey"}]

answered May 21, 2019 at 0:12

Cary Swoveland

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