I'm looking to find all combinations of single items from a variable number of arrays. How do I do this in Ruby?
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"]]
How could this code work when groups contains a variable number of arrays?
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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