散列的散列的 Ruby 散列

Question

我怎样才能得到哈希的哈希？

我的测试返回

undefined method `[]' for nil:NilClass (NoMethodError)

有什么建议吗？

found = Hash.new()
x = 1;

while x < 4 do
  found[x] = Hash.new()
  y = 1

  while y < 4 do
    found[x][y] = Hash.new()
    found[x][y]['name1'] = 'abc1'
    found[x][y]['name2'] = 'abc2'
    found[x][y]['name3'] = 'abc3'

    y += 1
  end

  x += 1
end

found.each do |k, v, y|
  puts "k : #{k}"
  puts "  : #{v[y['name1']]}"
  puts "  : #{v[y['name2']]}"
  puts "  : #{v[y['name3']]}"
  puts
end

Answer 1

我想你想要这样的东西:

首先创建数据结构。您需要嵌套哈希，因此您需要为每个哈希键定义默认值。

found = Hash.new do |hash,key| 
    hash[key] = Hash.new do |hash,key|
        hash[key] = Hash.new
    end
end

运行搜索

(1..3).each do |x|
  (1..3).each do |y|
    found[x][y]['name1'] = 'abc1'
    found[x][y]['name2'] = 'abc1'
    found[x][y]['name3'] = 'abc1'    
  end
end

然后显示结果

found.each do |x, y_hash|
  y_hash.each do |y, name_hash|
    name_hash.each do |name, value|
      puts "#{x} => #{y} => #{name} => #{value}"
    end
  end
end