Class: Nps::Calculator

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

Instance Method Summary collapse

Constructor Details

#initialize(ballot) ⇒ Calculator

Internal: Initialize a Net Promoter Score (NPS) calculator

ballot - a ballot of votes in the NPS survey.



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# File 'lib/nps/calculator.rb', line 7

def initialize(ballot)
  @ballot = ballot
end

Instance Method Details

#percentage_of_detractors ⇒ Object

Internal: The percentage of detractor votes in the ballot.



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# File 'lib/nps/calculator.rb', line 27

def percentage_of_detractors
  @ballot.any_votes? ? ((detractors.to_f / @ballot.total_votes.to_f) * 100.0).round(2) : 0.0
end

#percentage_of_passives ⇒ Object

Internal: The percentage of passive votes in the ballot.



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# File 'lib/nps/calculator.rb', line 22

def percentage_of_passives
  @ballot.any_votes? ? ((passives.to_f / @ballot.total_votes.to_f) * 100.0).round(2) : 0.0
end

#percentage_of_promoters ⇒ Object

Internal: The percentage of promoter votes in the ballot.



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# File 'lib/nps/calculator.rb', line 17

def percentage_of_promoters
  @ballot.any_votes? ? ((promoters.to_f / @ballot.total_votes.to_f) * 100.0).round(2) : 0.0
end

#score ⇒ Object

Internal: The Net Promoter Score (NPS) calculated from the ballot.



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# File 'lib/nps/calculator.rb', line 12

def score
  percentage_of_promoters - percentage_of_detractors
end