Class: Fsrs::Card

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

Overview

Card

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Card

Returns a new instance of Card.



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# File 'lib/fsrs/fsrs.rb', line 171

def initialize
  @due = DateTime.new
  @stability = 0.0
  @difficulty = 0.0
  @elapsed_days = 0
  @scheduled_days = 0
  @reps = 0
  @lapses = 0
  @state = State::NEW
end

Instance Attribute Details

#difficulty ⇒ Object

Returns the value of attribute difficulty.



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# File 'lib/fsrs/fsrs.rb', line 169

def difficulty
  @difficulty
end

#due ⇒ Object

Returns the value of attribute due.



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# File 'lib/fsrs/fsrs.rb', line 169

def due
  @due
end

#elapsed_days ⇒ Object

Returns the value of attribute elapsed_days.



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# File 'lib/fsrs/fsrs.rb', line 169

def elapsed_days
  @elapsed_days
end

#lapses ⇒ Object

Returns the value of attribute lapses.



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# File 'lib/fsrs/fsrs.rb', line 169

def lapses
  @lapses
end

#last_review ⇒ Object

Returns the value of attribute last_review.



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# File 'lib/fsrs/fsrs.rb', line 169

def last_review
  @last_review
end

#reps ⇒ Object

Returns the value of attribute reps.



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# File 'lib/fsrs/fsrs.rb', line 169

def reps
  @reps
end

#scheduled_days ⇒ Object

Returns the value of attribute scheduled_days.



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# File 'lib/fsrs/fsrs.rb', line 169

def scheduled_days
  @scheduled_days
end

#stability ⇒ Object

Returns the value of attribute stability.



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# File 'lib/fsrs/fsrs.rb', line 169

def stability
  @stability
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/fsrs/fsrs.rb', line 169

def state
  @state
end

Instance Method Details

#deep_clone ⇒ Object 



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# File 'lib/fsrs/fsrs.rb', line 192

def deep_clone
  Marshal.load(Marshal.dump(self))
end

#get_retrievability(now) ⇒ Object 



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# File 'lib/fsrs/fsrs.rb', line 182

def get_retrievability(now)
  decay = -0.5
  factor = (0.9**(1 / decay)) - 1

  return nil unless @state == State::REVIEW

  elapsed_days = [0, (now - @last_review).to_i].max
  (1 + (factor * elapsed_days / @stability))**decay
end