Question

我试图仅打印给定的值，但不输入输入。如果我打印11月的内容，则只打印学生所在的队列。

我尝试了student.fetch（cohort_input）.include？（月）但不起作用。有人告诉我我需要创建要检查的月份列表

months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]

def input_students
  puts "Please enter the names of the students"
  puts "To finish, just hit return twice"
  students = []
  while name = gets.chomp do
    break if name.empty?
    puts "What is your student cohort"
    cohort = gets.chomp
    puts "Where is your student from"
    country_of_birth = gets.chomp
    if cohort.empty? || country_of_birth.empty?
      cohort = "Not given"
      country_of_birth = "(Not given)"
    end
    students << {name: name, cohort: cohort, country_of_birth: country_of_birth}
    if students.count > 1
      puts "Now we have #{students.count} students"
    else
      puts "Now we have #{students.count} student"
    end
    puts "Enter another name"
  end
  students
end

def print_header
puts "The students of Villains Academy"
puts "-------------"
end



def print(students)
puts "What cohort would you like to print"
  cohort_input = gets.chomp#.capitalize
  students.map do |student|
    student.map {|k,v| [k, v.to_sym]
  }
  #puts " #{student[:name]} (#{student[:cohort]} cohort), #{student[:country_of_birth]}"
  end
  students.each do |student|
    if cohort_input == months[]
      puts student[:name]
    end
  end
end


def print_footer(students)
  if students.count > 1
    puts "Overall, we have #{students.count} great students"
  else
    puts "Overall, we have #{students.count} great student"
  end
end

students = input_students
print_header
print(students)
print_footer(students)```

All kind of errors

Answer 1

print方法有点混乱，它正在调用months变量，该变量不存在。

测试数据集，以防万一有人发现它有用：

students = [{:name=>"Peter", :cohort=>"A", :country_of_birth=>"Here"}, {:name=>"Popeye", :cohort=>"A", :country_of_birth=>"There"}, {:name=>"Tom", :cohort=>"A", :country_of_birth=>"Where"}, {:name=>"Jack", :cohort=>"J", :country_of_birth=>"Here"}, {:name=>"Ron", :cohort=>"J", :country_of_birth=>"There"}, {:name=>"Ross", :cohort=>"R", :country_of_birth=>"Anywhere"}]

使用Array#select尝试类似的操作：

def my_print(students)
  puts "What cohort would you like to print"
  cohort_input = gets.chomp#.capitalize
  students.select{ |s| s[:cohort] == cohort_input }.each {|student| p student }
end

旁注，请勿使用print作为方法名称。

从哈希数组中打印输入值

1 个答案: