arrays - 如何从一个用空格分隔的字符串中随机选择一组项目？

给出如下字符串：

string = "hotdog cat food pickle sock ring lock fist door"

随机挑选4个项目（用空格分隔）的正确方法是什么所以我可以回去：

result = "fist_sock_food_cat"

谢谢

最佳答案

您可以使用String#split和Array#sample：

string
  .split     #=> ["hotdog", "cat", "food", "pickle", "sock", "ring", "lock", "fist", "door"]
  .sample(4) #=> ["ring", "pickle", "food", "fist"]
  .join('_') #=> "ring_pickle_food_fist"