ruby on rails的数组迭代

# 假设我们有一个用户数组
users = [
  { name: 'Alice', age: 30 },
  { name: 'Bob', age: 25 },
  { name: 'Charlie', age: 35 }
]

# 使用each方法迭代数组
users.each do |user|
  puts "#{user[:name]} is #{user[:age]} years old."
end

# 使用map方法生成新数组
user_names = users.map { |user| user[:name] }
puts user_names.inspect  # 输出: ["Alice", "Bob", "Charlie"]

# 使用select方法筛选数组
young_users = users.select { |user| user[:age] < 30 }
puts young_users.inspect  # 输出: [{:name=>"Alice", :age=>30}, {:name=>"Bob", :age=>25}]

users.each do |user|
  next if user.nil?
  puts "#{user[:name]} is #{user[:age]} years old."
end

users.each do |user|
  if user.is_a?(Hash) && user.key?(:name) && user.key?(:age)
    puts "#{user[:name]} is #{user[:age]} years old."
  else
    puts "Invalid user data: #{user.inspect}"
  end
end