Ruby/Development/rand
Материал из Wiki.crossplatform.ru
Версия от 17:10, 26 мая 2010; (Обсуждение)
Содержание[убрать] |
Generate random numbers
def random_word letters = { ?v => "aeiou", ?c => "bcdfghjklmnprstvwyz" } word = "" "cvcvcvc".each_byte do |x| source = letters[x] word << source[rand(source.length)].chr end return word end puts random_word # => "josuyip" puts random_word # => "haramic"
Generating Random Numbers
puts rand # => 0.517297883846589 puts rand # => 0.946962603814814
Get a random item in an array
a = ["item1", "item2", "item3"] a[rand(a.size)] # => "item3"
Get a random value in a hash
m = { :key1 => "value1", :key2 => "value2", :key3 => "value3" } values = m.values values[rand(values.size)] # => "value1"
Random with a range
puts rand(5) # => 0 puts rand(5) # => 4 puts rand(5) # => 3 puts rand(1000) # => 39
Some random numbers based on process number and current time
rand(1000) # => 187 rand(1000) # => 551 rand(1000) # => 911
Start the seed with the number 1
srand 1 rand(1000) # => 37 rand(1000) # => 235 rand(1000) # => 908 # Reset the seed to its previous state srand 1 rand(1000) # => 37 rand(1000) # => 235 rand(1000) # => 908
