Class: Sm2::Fact

Inherits:
Object
  • Object
show all
Defined in:
lib/sm2/fact.rb

Constant Summary collapse

MAX_GRADE = 
5
D_EF =

D_EF = (0.1 - (MAX_GRADE - grade) * (0.08 + (MAX_GRADE - grade) * 0.02))

{
  5 => 0.1,
  4 =>  0,
  3 => -0.14,
  2 => -0.32,
  1 => -0.54,
  0 => -0.8
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(easiness_factor: nil, repetition: nil, interval: nil) ⇒ Fact

Returns a new instance of Fact.



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# File 'lib/sm2/fact.rb', line 16

def initialize(easiness_factor: nil, repetition: nil, interval: nil)
  @easiness_factor = easiness_factor || 2.5
  @repetition = repetition || 0
  @interval = interval
end

Instance Attribute Details

#easiness_factor ⇒ Object (readonly)

Returns the value of attribute easiness_factor.



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# File 'lib/sm2/fact.rb', line 14

def easiness_factor
  @easiness_factor
end

#interval ⇒ Object (readonly)

Returns the value of attribute interval.



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# File 'lib/sm2/fact.rb', line 14

def interval
  @interval
end

#repetition ⇒ Object (readonly)

Returns the value of attribute repetition.



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# File 'lib/sm2/fact.rb', line 14

def repetition
  @repetition
end

Instance Method Details

#next_interval(grade) ⇒ Object 



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# File 'lib/sm2/fact.rb', line 22

def next_interval(grade)
  grade = MAX_GRADE if grade > MAX_GRADE

  if grade >= 3
    if repetition == 0
      @interval = 1
      @repetition = 1
    elsif repetition == 1
      @interval = 6
      @repetition = 2
    else
      @interval = (interval * easiness_factor).round
      @repetition = repetition + 1
    end
  else
    @repetition = 0
    @interval = 1
  end

  @easiness_factor = (easiness_factor + D_EF[grade]).round(2)
  @easiness_factor = easiness_factor < 1.3 ? 1.3 : easiness_factor

  return interval
end