Nested keys

gistfile1.rb

recursive_array = lambda do |array, result|
	array.each do |item|
  	result << item[:name] if item[:name]
  	recursive_array.call(item[:children], result) if item[:children]
  end
  result
end

a = [
  {name: "Folder 1",
    children: [
      {name: "File 1"},
      {name: "File 2"},
      {name: "File 3"},
      {name: "Folder 1",
        children: [
          {name: "File in folder 1-1"},
          {name: "File in folder 1-2"},
          {name: "Folder 2",
            children: [
              {name: "File in folder 2-1"},
              {name: "File in folder 2-2"}
            ]
          }
        ]
      }
    ]
  }
]
puts recursive_array.call(a, [])