[Rails] notaion: Hash[*array_variable.flatten]

Ruby on Rails Friday, September 27, 2013

Can someone explain what the "*" operator inside the hash is doing here or what that notation is referred to in this context ? thanks

irb(main):006:0* mail_config

=> {"server_setings"=>{"address"=>"smpt-int.ex1.com", "port"=>25}}

irb(main):019:0> Hash[*mail_config['server_setings'].map { |k, v| [k.to_sym, v.t

o_s] }.flatten]

=> {:address=>"smpt-int.ex1.com", :port=>"25"}

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