Class: ChangeFinal::Different

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/change_final.rb

Constant Summary collapse

CONVERSIONS =

lookup table

{
  kg: {
    pounds: 2.20462,
    stone: 0.157473,
  },
  pounds: { 
    kg: 0.453592,
    stone: 0.0714286
  },
  stone: {
    kg: 6.35029,
    pounds: 14  
  }
}

Instance Method Summary collapse

Instance Method Details

#conversions(value, unit) ⇒ Object 



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# File 'lib/change_final.rb', line 30

def conversions(value, unit)
  CONVERSIONS[unit].keys.map do |other_unit|
    convert(value, unit, to: other_unit)
  end
end

#convert(value, from, to:) ⇒ Object

Raises:



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# File 'lib/change_final.rb', line 24

def convert(value, from, to:)
  raise ConversionError, "Value is not numeric" unless value.is_a? Numeric
  raise ConversionError, "Value #{value} is not positive" unless value >= 0
  "#{value * conversion_ratio(from, to) }#{to.to_s}"
end