ruby - 如何从随机数组中选择一个随机元素？

Question

我是一名 Ruby 初学者，正在尝试向我的刽子手游戏中添加多个类别。

我知道如何从数组中随机选择一个元素。例如:

animals = ['dog', 'cat', 'mouse']
random = animals[rand(animals.length)] 
puts random

但是，我想随机选择整个数组，然后从该随机数组中随机选择一个元素。例如:

animals = ['dog', 'cat', 'mouse']
planets = [['jupiter'], ['mars']]
fruits = [['apple'], ['orange'], ['mango']]

categories =[[animals], [planets], [fruits]]

#the code I tried was:
random_array = categories[rand(categories.length)]
random_element = random_array[rand(random_array.length)]
puts random_element

但这会放置整个数组，而不是一个元素。请帮忙!谢谢

Answer 1

animals = ['dog', 'cat', 'mouse']
planets = [['jupiter'], ['mars']]
fruits = [['apple'], ['orange'], ['mango']]

categories = [animals, planets, fruits]
puts categories.sample.sample #=> jupiter

正如 Sawa 所说，这将返回一个字符串或一个子数组。 *categories.sample.sample(一个 splat)总是重新调整一个字符串。