Module: RDGC::Util::RandomUtil

Defined in:
lib/rdgc/util/random_util.rb

Class Method Summary collapse

Class Method Details

.bool_rand ⇒ Object 



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# File 'lib/rdgc/util/random_util.rb', line 8

def bool_rand
  case rand(2)
  when 1
    true
  when 0
    false
  end
end

.dice(n, max) ⇒ Object 



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# File 'lib/rdgc/util/random_util.rb', line 48

def dice(n, max)
  ret = 0
  n.times{ret += range_rand(1, max)}
  ret
end

.range_rand(s_val, e_val) ⇒ Object 



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# File 'lib/rdgc/util/random_util.rb', line 17

def range_rand(s_val, e_val)
  return s_val if e_val <= s_val
  s_val + rand((e_val - s_val)+1)
end

.select_rand(hash) ⇒ Object 



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# File 'lib/rdgc/util/random_util.rb', line 22

def select_rand(hash)
  return unless hash
  return if hash.empty?

  range_list = []
  count = 0
  hash.each do |k, v|
    range = count...(count + v)
    range_list << [range, k]
    count += v
  end
  return if count <= 0

  val = rand(count)

  ret = nil
  range_list.each do |r|
    if r.first.include?(val)
      ret = r.last
      break
    end
  end

  ret
end