símbolos usados ​​em hashes

# 'Rocket' syntax 
american_cars = { 
  :chevrolet => "Corvette", 
  :ford => "Mustang", 
  :dodge => "Ram" 
}
# 'Symbols' syntax
japanese_cars = { 
  honda: "Accord", 
  toyota: "Corolla", 
  nissan: "Altima" 
}
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