액세스 해시 키, NoMethodError

Question

나는 사용자 입력 변수 해시에 액세스하려고이 오류 메시지가 얻을

이 설명해야 내 문제가 조금 더 좋다 ... 문자열 "n"이 변수에 저장되면 변수는 해시에 더 이상 액세스 할 수 없으며 nil을 반환합니다. 왜?

[6] pry(main)> line = "n" 
=> "n" 
[7] pry(main)> subway[:line] 
=> nil 
[8] pry(main)> subway[:"n"] 
=> ["timessquare", "34th", "28th", "23rd", "unionsquare", "8th"] 
[9] pry(main)> line 
=> "n" 

This is the .rb file 



n = ["timessquare", "34th","28th","23rd","unionsquare","8th"] 
l = ["8th", "6th", "unionsquare","3rd","1st"] 
six = ["grandcentral","33rd","28th","23rd","unionsquare","astorplace"] 

subway = {:n=>n, :l=> l, :six=>six} 


puts "Where would you like to go?" 
destination = gets.strip.chomp.downcase.delete(" ") 



puts "What line is that on?" 
endline = gets.strip.chomp.downcase.delete(" ") 


puts "What station will you be departing from?" 
location = gets.strip.chomp.downcase.delete(" ") 


puts "What line is that on?" 
startline = gets.strip.chomp.downcase.delete(" ") 


if startline == endline 
    puts (startline.index(destination)-startline.index(location)).abs 
else 
    puts "You have #{(subway[:startline].index(location) - subway[:startline].index("unionsquare")).abs} stops until transfer" 
    puts "After you have #{(subway[:endline].index(destination) - subway[:endline]index("unionsquare")).abs} until your destination"  
end  

단순히 심볼에 라인을 변환 할 필요가

Answer 1

: subway[line.to_sym]