Ruby on Rails

def conditions_combination step_conditions_labels

    conditions_combination_hash = Hash.new

    1.upto(step_conditions_labels.size).flat_map do |n|

      conditions_combination = ""

      step_conditions_labels.permutation(n).map { |condition|  

        if condition.length == n

          conditions_combination += "( "

          condition.each do |condition_label|

            conditions_combination += condition_label+" && "

          end

          conditions_combination = conditions_combination.chomp(' && ')

          conditions_combination += " ) || "

        end

        conditions_combination_hash[n.to_s] = conditions_combination.chomp(' || ').chomp(' && ')   

      } 

    end

    cond = false

    condition_check = conditions_combination_hash[step_conditions_labels.length.to_s]

    if condition_check

      cond = true

    end

    return cond

  end

I have created this function 

conditions_combination_hash = conditions_combination(['true','false','true'])

which gives me different combination like this 

{"1"=>"( true ) || ( false ) || ( true )", "2"=>"( true && false ) || ( true && true ) || ( false && true ) || ( false && true ) || ( true && true ) || ( true && false )", "3"=>"( true && false && true ) || ( true && true && false ) || ( false && true && true ) || ( false && true && true ) || ( true && true && false ) || ( true && false && true )"}

Issue is now I am not able use this combination to check whether it satisfies the condition as it is consider as string class.