ruby - Array multiplication - what is the best algorithm? -


i have make multiplication of n arrays.

example :

  • input = ["a", "b", "c"] * ["1", "2"] * ["&", "(", "$"]
  • output = ["a1&", "a1(", "a1$", "a2&", "a2(", "a2$", "b1&", "b1(", "b1$", "b2&", "b2(", "b2$, "c1&, "c1(, "c1$, "c2&", "c2(", "c2$"]

i have created algorithm that, works good.

# input entries = ["$var1$", "$var2$", "$var3$"] data = [["a", "b", "c"], ["1", "2"], ["&", "(", "$"]]  num_combinaison = 1 data.each { |item| num_combinaison = num_combinaison * item.length  }  result = [] in 1..num_combinaison   result.push entries.join() end  num_repetition = num_combinaison data.each_index |index|   item = array.new(data[index])   num_repetition = num_repetition / item.length   in 1..num_combinaison     result[i-1].gsub!(entries[index], item[0])     if % num_repetition == 0       item.shift       item = array.new(data[index]) if item.length == 0     end   end end

i'm sure there best way that, don't find it. have tried use product or flatten function without success.

somebody see best solution ?

thanks help.

eric

class array   def * other; product(other).map(&:join) end end  ["a", "b", "c"] * ["1", "2"] * ["&", "(", "$"] # => # ["a1&", "a1(", "a1$", "a2&", "a2(", "a2$", "b1&", "b1(", "b1$", "b2&", # "b2(", "b2$", "c1&", "c1(", "c1$", "c2&", "c2(", "c2$"]

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