Class: Calculator

Inherits:
Object
  • Object
show all
Defined in:
lib/wilks_calc/calculator.rb

Constant Summary collapse

COEFFICIENTS = 
{
  'A': { 'M': -216.0475144, 'F': 594.31747775582 },
  'B': { 'M': 16.2606339, 'F': -27.23842536447 },
  'C': { 'M': -0.002388645, 'F': 0.82112226871 },
  'D': { 'M': -0.00113732, 'F': -0.00930733913 },
  'E': { 'M': ("%.11f" % "7.01863e-06").to_f, 'F': ("%.15f" % "4.731582e-05").to_f },
  'F': { 'M': ("%.13f" % "-1.291e-08").to_f, 'F': ("%.15f" % "-9.054E-08").to_f }
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sex, bodyweight, weight_lifted) ⇒ Calculator

Returns a new instance of Calculator.



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# File 'lib/wilks_calc/calculator.rb', line 13

def initialize(sex, bodyweight, weight_lifted)
  @sex = sex
  @bw = bodyweight.to_f
  @wl = weight_lifted.to_f
end

Instance Attribute Details

#bw ⇒ Object (readonly)

Returns the value of attribute bw.



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# File 'lib/wilks_calc/calculator.rb', line 2

def bw
  @bw
end

#sex ⇒ Object (readonly)

Returns the value of attribute sex.



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# File 'lib/wilks_calc/calculator.rb', line 2

def sex
  @sex
end

#wl ⇒ Object (readonly)

Returns the value of attribute wl.



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# File 'lib/wilks_calc/calculator.rb', line 2

def wl
  @wl
end

Instance Method Details

#calculate ⇒ Object 



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# File 'lib/wilks_calc/calculator.rb', line 19

def calculate
  (wl * 500 / coeff_calculator).round(2)
end

#coeff_calculator ⇒ Object 



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# File 'lib/wilks_calc/calculator.rb', line 23

def coeff_calculator()
  ('A'..'F').to_a.each_with_index.reduce(0) do |memo, (coeff, index)|
    memo += power(coeff, index)
  end
end

#power(coeff, p) ⇒ Object 



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# File 'lib/wilks_calc/calculator.rb', line 29

def power(coeff, p)
  COEFFICIENTS[coeff.to_sym][sex.to_sym] * bw ** p
end