查找可变数量的Ruby数组的产品
我希望从可变数量的数组中找到单个项目的所有组合。 我如何在Ruby中执行此操作？
给定两个数组，我可以像这样使用Array.product：
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？
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"] # ]