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sepastian
/ multi_cartesian_product.rb
Last active
January 11, 2023 09:26
Build the cartesian product of multiple arrays in Ruby.
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| # Given an array of arrays s = [ [1,2,3], [4,5,6], ... ] | |
| # compute the Cartesian product among the elements of s. | |
| require 'pp' | |
| s = [[1, 2], [3, 4, 5], [6, 7, 8, 9]] | |
| pp s[1..-1].inject(s[0]){ |m,v| m = m.product(v).map(&:flatten) } | |
| [[1, 3, 6], | |
| [1, 3, 7], | |
| [1, 3, 8], |
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| # Activate the gem you are reporting the issue against. | |
| gem 'activerecord', '4.2.6' | |
| require 'active_record' | |
| require 'minitest/autorun' | |
| require 'logger' | |
| $logger = Logger.new(STDOUT) | |
| # This connection will do for database-independent bug reports. | |
| ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:') |