Question

我有一组嵌套的哈希。我想将字符串“Assembly”添加到与[：dennis_ritche]相关联的数组值[：languages]

def adding_to_dennis
    programmer_hash =
        {
        :grace_hopper => {
          :known_for => "COBOL",
          :languages => ["COBOL", "FORTRAN"]
        },
        :alan_kay => {
          :known_for => "Object Orientation",
          :languages => ["Smalltalk", "LISP"]
        },
        :dennis_ritchie => {
          :known_for => "Unix",
          :languages => ["C"]
        }
     }
        programmer_hash[:dennis_ritchie][:languages] << "Assembly"
end

这是错误，我没有将Symbol隐式转换为整数“

Answer 1

我认为您遇到的问题是您正在操纵方法内部的哈希值，结果无意中返回了错误的内容。此方法返回一个数组，因为它执行的最后一个操作（在{Array上<<返回修改后的数组）。

要修复它，请定义执行操作的方法：

def add_to_hash(hash, programmer = :dennis_ritchie, language = 'Assembly')
  hash[programmer][:languages] << language
end

使其独立于定义：

programmer_hash =
    {
    :grace_hopper => {
      :known_for => "COBOL",
      :languages => ["COBOL", "FORTRAN"]
    },
    :alan_kay => {
      :known_for => "Object Orientation",
      :languages => ["Smalltalk", "LISP"]
    },
    :margaret_hamilton => {
      :known_for => "Apollo Program",
      :languages => ["Assembly"]
    },
    :dennis_ritchie => {
      :known_for => "Unix",
      :languages => ["C"]
    }
 }

然后调用它来操纵哈希：

add_to_hash(programmer_hash)

然后更新programmer_hash结构。

将字符串添加到嵌套在哈希内部的数组中

1 个答案: