Class: Dogfood::Randomness

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(seed: nil) ⇒ Randomness

Returns a new instance of Randomness.



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# File 'lib/dogfood/randomness.rb', line 7

def initialize(seed: nil)
  @seed = seed || Random.new_seed
  @random = Random.new(@seed)
end

Instance Attribute Details

#seed ⇒ Object (readonly)

Returns the value of attribute seed.



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# File 'lib/dogfood/randomness.rb', line 5

def seed
  @seed
end

Instance Method Details

#branch(weights) ⇒ Object 



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# File 'lib/dogfood/randomness.rb', line 12

def branch(weights)
  total = weights.values.sum.to_f
  threshold = @random.rand * total
  cumulative = 0.0

  weights.each do |key, weight|
    cumulative += weight
    return key if threshold < cumulative
  end

  weights.keys.last
end

#pick(collection) ⇒ Object 



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# File 'lib/dogfood/randomness.rb', line 25

def pick(collection)
  collection.sample(random: @random)
end

#rand(range = nil) ⇒ Object 



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# File 'lib/dogfood/randomness.rb', line 33

def rand(range = nil)
  range ? @random.rand(range) : @random.rand
end

#sample(collection, count) ⇒ Object 



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# File 'lib/dogfood/randomness.rb', line 29

def sample(collection, count)
  collection.sample(count, random: @random)
end