Question

我的代码：

alea = ["x", " "]
num = alea.length
choice = rand(num)
veinte = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

for i in veinte
    puts alea[choice]
end

我希望我的代码随机选择几个选项，而不仅仅是一个。例如：

x

x
x

x
x
x

我该怎么做？

Answer 1

Array#sample是为此目的而发明的：

-encryptnativelibraries

Answer 2

只需编辑代码：

alea = ["x", " "]
num = alea.length
choice = rand(num)
veinte = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
veinte.map { puts alea[rand(alea.length)] }

Answer 3

根据您编写的代码，您获得的输出是正确的：

alea = ["x", " "]  # => Array on only two elements
num = alea.length  # => 2
choice = rand(num) # => rand(2) will only output either 0 or 1 which will always output either alea[0] or alea[1] which is " " or "x"

如果你真的想要一个Array的随机值，那么要么使用@mudasobwa建议的Array类的sample方法

Answer 4

您似乎只需要一定数量的随机选择项目。在这种情况下，只需使用块形式的构造函数：

Array.new(10){ ["x", " "].sample }

#=>[" ", " ", "x", " ", "x", " ", "x", " ", "x", "x"]

Ruby使用rand方法随机选择几个选项

4 个答案: