class Convert

Convert method will loop over units and will check if unit is nil, celsius, kelvin or fahrenheit. It will convert the temperature in celsius, kelvin or fahrenheit @param [String] some wanted values:

* :unit [String] The unit of the temperature
* :temperature [Double] The value of the temperature

@return [Double] the resulting temperature @example

convert.convert(86, 'fahrenheit')
returns: 30

# File lib/convert.rb, line 16
def convert(temperature, unit)
  return temperature if unit.nil?
  return temperature if unit == 'celsius'
  return temperature - 273.15 if unit == 'kelvin'
  return (temperature - 32) / 1.8 if unit == 'fahrenheit'
end