如何在Ruby中随机选择两个变量？

Question

如何制作一个方法让Ruby在两个变量之间进行选择？例如，我想让Ruby随机输出＆＃34; Dog＆＃34;或者＆＃34; Cat＆＃34;

Answer 1

您可以轻松使用sample。

如果你正在使用数组：

myArray = ["Cat", "Dog", "Turtle"]
puts myArray.sample

如果要在两个变量之间进行选择：

cat = "Cat"
dog = "Dog"
puts [cat, dog].sample

您可以在documentation

中详细了解示例

Answer 2

既然你说你想在两个变量之间做出选择，这就是我的意思：

dog = "Dog"
cat = "Cat"
[dog, cat].sample

Answer 3

对随机数使用三元条件。

z = 'Milwaukee'
y = 'Chicago'
10.times {|x| puts rand(2) == 1 ? z : y}

Answer 4

您可以使用eval或sample数组方法，请查看以下示例。

arr = [dog="dog", cat="cat", turtle="turtle"]

## OUTPUT

2.2.1 :015 > dog
 => "dog" 
2.2.1 :016 > cat
 => "cat" 
2.2.1 :017 > turtle
 => "turtle"

## Using eval with sample

2.2.1 :018 > eval(arr.sample)
 => "dog" 
2.2.1 :019 > eval(arr.sample)
 => "cat" 
2.2.1 :020 > eval(arr.sample)
 => "turtle"

## OR (using sample)

2.2.1 :021 > arr.sample
 => "dog" 
2.2.1 :022 > arr.sample
 => "turtle" 
2.2.1 :023 > arr.sample
 => "cat"