initialization - Why is this local variable labeled as undefined? - Ruby -

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i've got function goes through array of objects, , creates new array of objects based on attributes original array. when run code error

in 'nonstop': undefined local variable or method `sort_list' main:object (nameerror)

i made sure sort_list array initialized outside of loop, , i've tried initializing size too, keep getting error. i'm pretty new ruby, doing incorrectly?

    def nonstop(flight_list)       index = 0       sort_list[] = nil       flight_list.each |curr|         if (curr.depapt == argv[2] && curr.arrapt == argv[3])           sort_list[index] = curr           index += 1         end       end       sort_list.sort! { |a,b|  a.deptime <=> b.deptime}       sort_list.each |curr|          puts "#{curr.flightnum}\t#{curr.deptime}\t#{curr.arrtime}"       end       if (sort_list.empty?)         puts "none"       end     end

i think need initialize this:

sort_list = []

this doesn't throw error in irb me.


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