Array of arrays to hash conversion

array_of_arrays_to_hash.rb

##
# Array of arrays to hash conversion
#

##
#  Version 1
array = [[1, 1], [2, 2], [3, 3]]

hash = Hash[*array.flatten]

p hash
# => {1=>1, 2=>2, 3=>3}

##
# Version 2
class Array
  def to_hash
    Hash[*self.flatten]
  end
end

array = [[1, 1], [2, 2], [3, 3]]

p array.to_hash
# => {1=>1, 2=>2, 3=>3}


http_header_rules = [
  [:global, {'Cache-Control' =>'public, max-age=42'}], 
  [:fonts, {'Access-Control' => '*'}]
]

p http_header_rules.to_hash
# => {:global=>{"Cache-Control"=>"public, max-age=42"}, :fonts=>{"Access-Control"=>"*"}}

Via: Ruby Pearls vol. 1 - The Splat