如何在Ruby中干燥兩個函數？

Question

是否可以通過將兩個函數共享的三行移動到另一個函數來干燥這兩個Ruby函數？

def format_currency(number)
  number_to_currency(number, 
    :unit       => current_user.currency_unit, 
    :delimiter  => current_user.currency_delimiter, 
    :separator  => current_user.currency_separator, 
    :format     => current_user.currency_format
  )
end

def format_currency_for_pdf(number, invoice)    
  number_to_currency(number / invoice.exchange_rate, 
    :unit       => CURRENCIES[invoice.currency]
    :delimiter  => current_user.currency_delimiter, 
    :separator  => current_user.currency_separator, 
    :format     => current_user.currency_format
  )
end

謝謝你的幫助？

Answer 1

def format_currency(number)
  number_to_currency(number, 
    currency_hash(current_user.currency_unit) 
  )
end

def format_currency_for_pdf(number, invoice)    
  number_to_currency(number / invoice.exchange_rate, 
    currency_hash(CURRENCIES[invoice.currency])
  )
end

def currency_hash(unit)
  {
    :unit       => unit,
    :delimiter  => current_user.currency_delimiter, 
    :separator  => current_user.currency_separator, 
    :format     => current_user.currency_format
  }
end

Answer 2

正如芋頭所暗示的，它將是：

def format_currency(number)
  number_to_currency(number,
    currency_hash(current_user.currency_unit)
  )
end

def format_currency_for_pdf(number, invoice)
  number_to_currency(number / invoice.exchange_rate,
    currency_hash(CURRENCIES[invoice.currency])
  )
end

def currency_hash unit
  {
    :unit       => unit,
    :delimiter  => current_user.currency_delimiter,
    :separator  => current_user.currency_separator,
    :format     => current_user.currency_format
  }
end