查找可变数量的Ruby数组的乘积 [英] Finding the product of a variable number of Ruby arrays

问题描述

我正在寻找从数量可变的数组中找到单个项目的所有组合.如何在Ruby中做到这一点?

I'm looking to find all combinations of single items from a variable number of arrays. How do I do this in Ruby?

给出两个数组，我可以像这样使用Array.product:

Given two arrays, I can use Array.product like this:

groups = []
groups[0] = ["hello", "goodbye"]
groups[1] = ["world", "everyone"]

combinations = groups[0].product(groups[1])

puts combinations.inspect 
# [["hello", "world"], ["hello", "everyone"], ["goodbye", "world"], ["goodbye", "everyone"]]

当组包含可变数量的数组时，此代码如何工作?

How could this code work when groups contains a variable number of arrays?

推荐答案

groups = [
  %w[hello goodbye],
  %w[world everyone],
  %w[here there]
]

combinations = groups.first.product(*groups.drop(1))

p combinations
# [
#   ["hello", "world", "here"],
#   ["hello", "world", "there"],
#   ["hello", "everyone", "here"],
#   ["hello", "everyone", "there"],
#   ["goodbye", "world", "here"],
#   ["goodbye", "world", "there"],
#   ["goodbye", "everyone", "here"],
#   ["goodbye", "everyone", "there"]
# ]

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