Wizard

wizard.rb

class School
  SCHOOL_DATA = [
   {
     name: 'Beauxbatons Academy of Magic',
     location: 'Pyrenees, France',
     courses: {
       muggle_studies: 5,
       wand_practice: 41,
       defence_against_the_dark_arts: 25,
       herbology: 15,
       quidditch: 100
     }
   },
   {
     name: 'Castelobruxo',
     location: 'Amazon rainforest, Brazil',
     courses: {
       advanced_broom_making: 32,
       wand_practice: 54,
       defence_against_the_dark_arts: 10,
       scrying: 80,
       beast_studies: 100
     }
   },
   {
     name: 'Durmstrang Institute',
     location: 'Scandinavia',
     courses: {
       potions: 35,
       wand_practice: 10,
       dark_arts: 90,
       dueling: 63,
       advanced_animagus: 8
     }
   },
   {
     name: 'Hogwarts School of Witchcraft and Wizardry',
     location: 'Highlands, Scotland',
     courses: {
       wand_practice: 22,
       magical_creatures_studies: 70,
       potions: 90,
       defence_against_the_dark_arts: 90,
       herbology: 38
     }
   },
   {
     name: 'Ilvermorny School of Witchcraft and Wizardry',
     location: 'Mount Greylock, United States of America',
     courses: {
       magical_creatures: 53,
       wand_practice: 22,
       dark_arts: 41,
       magical_banking: 89,
       quidditch: 40
     }
   }
  ]

  def self.best_suited_for(student_ratings = {})
    return '' unless student_ratings.count { |_, rating| rating > 0 } >= 5

    SCHOOL_DATA.max_by do |school|
      school[:courses].map do |course, score|
        score * student_ratings[course].to_i
      end.reduce(:+)
    end
  end
end

ratings = {
  muggle_studies: 1,
  wand_practice: 9,
  defence_against_the_dark_arts: 0,
  herbology: 3,
  quidditch: 6,
  advanced_broom_making: 0,
  scrying: 8,
  potions: 0,
  dueling: 0,
  advanced_animagus: 0,
  magical_creatures_studies: 0,
  magical_creatures: 0,
  magical_banking: 0
}

School.best_suited_for(ratings) # must equal 'Castelobruxo'