Class: Randomer::Percent

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

Class Method Summary collapse

Class Method Details

.pick_one(hash) ⇒ Object

根据一个hash中value指定的权重随机获取一个Symbol或String

params

Hash hash

return

Symbol key

usage

Randomer::Percent.pick_one( 

:a => 60,
:b => 400,

)



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# File 'lib/randomer.rb', line 76

def pick_one(hash)
  sum_value = 0
  interval  = []
  keys      = []
  hash.each do |key, value|
    return false unless key.is_a? Symbol or key.is_a? String or key.is_a? Integer
    return false unless value.is_a? Integer

    interval << (sum_value...(sum_value += value))
    keys     << key
  end
  return false if sum_value <= 0

  count = interval.count
  rand_result = rand sum_value
  interval.each_with_index do |range, index|
    return keys[index] if range.include? rand_result
  end
end

.pick_some(hash, count, mutex = true) ⇒ Object 



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# File 'lib/randomer.rb', line 96

def pick_some(hash, count, mutex = true)
  hash = hash.clone
  _some = []
  count.times do
    key = self.pick_one hash
    next if not key
    _some << key
    hash.delete key if mutex
  end
  _some
end