Почему я получаю NoMethodError, повторяющуюся в Hash Embedded в массиве в Ruby?

Question

Я продолжаю получать следующее сообщение об ошибке для моего кода. (Попытка перебрать хеш, встроенный в массив, чтобы вернуть наибольшее значение и связанный с ним ключ). Ошибка появляется после первого цикла.

Traceback (последний вызов был последним): 6: из main.rb:53: в <main>' 5: from main.rb:53:inкарта ' 4: от main.rb:53: в each' 3: from main.rb:53:inраз ' 2: от main.rb:58: в block in <main>' 1: from main.rb:58:inкаждый 'main.rb: 60: in block (2 levels) in <main>': undefined method[] 'для nil:NilClass (NoMethodError)

#assigns number of participants in array 
num_participants = 2 

#embedded hash within array (of participants)

participants = [{"participant_name"=> "Liz Lee", "cupcakes_sold" => 41, "cupcakes_left" => 31, "cakes_sold" => 12, "cakes_left" => 2}, 
{"participant_name" => "John Jay", "cupcakes_sold" => 44, "cupcakes_left" => 2, "cakes_sold" => 22, "cakes_left" => 4}] 

#calculates total amount raised by each hash in participants array
#and populates new hash key 'proceeds' for each hash in participants array
#then loops through to update most_raised amount and assign highest_earner

counter = 0
most_raised = 0
highest_earner = ""

num_participants.times.map do 

 profits =  2 * participants[0 + counter]['cookies_sold']  - 
 participants[0 + counter]['cookies_left'] - 
 participants[0 + counter]['cookies_sold'] + 
 6 * participants[0 + counter]['cakes_sold'] - 
 3 * participants[0 + counter]['cakes_sold'] - 
 3 * participants[0 + counter]['cakes_left']
 participants[0 + counter]['proceeds'] = profits.to_i
 puts "\nProceeds raised by #{participants[0+counter]['participant_name'].capitalize}: 
 $#{participants[0+counter]['proceeds']}" +"."
 counter+=1

 ['participant_name', 'proceeds'].each do 

  if (max < profits)
   most_raised = participants[0+counter]['proceeds'].to_i
   highest_earner = participants[0+counter]['participant_name']
  end
 end
end

puts "#{highest_earner.capitalize} raised the most:$#{most_raised}"

Answer 1

Решение: я разделил свои петли.

#calculates total amount raised by each participant
counter = 0
participants.each do 
  profits =  2 * participants[0 + counter]['cookies_sold']  - 
             participants[0 + counter]['cookies_left'] - participants[0 + counter]['cookies_sold'] + 6 * participants[0 + counter]['cakes_sold'] - 
             3 * participants[0 + counter]['cakes_sold'] - 3 * 
             participants[0 + counter]['cakes_left']
  participants[0 + counter]['proceeds'] = profits.to_i
  puts "\n\e[36mProceeds raised by #{participants[0+counter]['participant_name'].capitalize}:\e[0m $#{participants[0+counter]['proceeds']}" +"."
  counter+=1
end

#calculates highest earner and highest amount raised
counter = 0
most_raised = 0 
highest_earner = ""
participants.each do 
  if (most_raised < participants[0+counter]['proceeds'])
    most_raised = participants[0+counter]['proceeds'].to_i
    highest_earner = participants[0+counter]['participant_name']
    counter+=1
  end
end
puts most_raised 
puts highest_earner

Answer 2

Так как вы установили counter=0, вы никогда не получите первый хеш при выполнении участниками [0 + counter] (который всегда равен участникам [0])

Я пропустил ваш счетчик +=1 Извините, этот ответ не имеет значения.