Question

我想要这个：

class Employees
    def initialize
        attr_accessor :first_name, :last_name, :class
    end

    person = Hash.new()
    person["Lauree Brown"] = "Terminated"
    person["Christie Gregour"] = "Active Employee"
    person["Ryan Dunn"] = "Active Employee"

返回具有员工身份的员工姓名。我只是打电话给哈希，还是我必须专门打电话给员工？这是完整的代码：

class Employees
    def initialize
        attr_accessor :first_name, :last_name, :class
    end

    person = Hash.new()
    person["Lauree Brown"] = "Terminated"
    person["Christie Gregour"] = "Active Employee"
    person["Ryan Dunn"] = "Active Employee"

    if person = "Terminated"
        puts "#{} is a terminated employee."
    else
        puts "#{} is an active employee."
    end
end

截至目前，它将返回：

  is terminated employee.
=> nil

Answer 1

这是尝试修复它并使其更像Ruby：

class Employee
  attr_accessor :first_name, :last_name, :status

  def initialize(first_name, last_name, status)
    @first_name = first_name
    @last_name = last_name
    @status = status
  end

  def to_s
    "%s %s is an %s Employee" % [
      first_name,
      last_name,
      status
    ]
  end
end

people = [ ]

people << Employee.new('Lauree', 'Brown', 'Terminated')
people << Employee.new('Christie', 'Gregour', 'Active')
people << Employee.new('Ryan', 'Dunn', 'Active')

people.each do |person|
  puts person.to_s
end

目前还不清楚为什么你宣布一个哈希，或者为什么你在attr_accessor内使用initialize，这是一个它甚至无法工作的地方，它不是一个实例方法。

还值得注意的是要特别注意=含义赋值和==含义比较。在您分配的示例中，因此第一个条件将始终触发，并且还会覆盖任何先前的数据。这可能不是你的意图。

Answer 2

您可以使用此代码。

person = Hash.new()
person["Lauree Brown"] = "Terminated"
person["Christie Gregour"] = "Active Employee"
person["Ryan Dunn"] = "Active Employee"

person.each do |key, value|
  if value == "Terminated"
    puts "#{key} is a terminated employee."
  else
    puts "#{key} is an active employee."
  end
end

从哈希中调用一个值

2 个答案: