Stack Overflow Questions Tags Users Badges Unanswered Ask Question ruby
来源：互联网 发布：中国软件与即时 编辑：程序博客网 时间：2024/05/01 11:38
["ABC", "DEF", "GHI"]should generate
["ADG", "ADH", "ADI", "AEG", "AEH", "AEI", "AFG", "AFH", "AFI", "BDG", "BDH", "BDI", "BEG", "BEH", "BEI", "BFG", "BFH", "BFI", "CDG", "CDH", "CDI", "CEG", "CEH", "CEI", "CFG", "CFH" "CFI"]This is what you need:
a = ["ABC","DEF", "GHI"]a.map(&:chars).reduce(&:product).map(&:join)a = ["ABC","DEF", "GHI"]first, *rest = a.map{|s| s.each_char.to_a}first.product(*rest).map(&:join)
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