safe navigation operator & and Enumerable #dig (ruby 2.3 and up)

safe_nav_op_enum_dig.rb

#Safe navigation operator
if account && account.owner && account.owner.address
  #your code here
end
#could be rewritten like
account&.owner&.address

#more examples
account = Account.new(owner: nil) # account without an owner
#
account.owner.address
# => NoMethodError: undefined method `address' for false:FalseClass `
account && account.owner && account.owner.address
# => false
account&.owner&.address
# => undefined method `address' for false:FalseClass`

account = Account.new(owner: false)
#
account.owner.address
# => NoMethodError: undefined method `address' for false:FalseClass `
account && account.owner && account.owner.address
# => false
account.try(:owner).try(:address)
# => nil
account&.owner&.address
# => undefined method `address' for false:FalseClass`


#Enumerable #dig
address = params[:account].try(:[], :owner).try(:[], :address)
# or
address = params[:account].fetch(:owner) .fetch(:address)
#could be rewritten like
address = params.dig(:account, :owner, :address)