Ruby:在散列中分配数组值

# 创建一个空的散列
my_hash = {}

# 分配数组值
my_hash["fruits"] = ["apple", "banana", "cherry"]
my_hash["colors"] = ["red", "green", "blue"]

# 输出散列内容
puts my_hash
# 输出: {"fruits"=>["apple", "banana", "cherry"], "colors"=>["red", "green", "blue"]}

# 访问特定键的值
puts my_hash["fruits"]
# 输出: ["apple", "banana", "cherry"]

# 添加更多元素到数组
my_hash["fruits"] << "date"
puts my_hash["fruits"]
# 输出: ["apple", "banana", "cherry", "date"]

# 使用fetch方法避免键不存在的情况
default_value = []
value = my_hash.fetch("unknown_key", default_value)
puts value
# 输出: []

my_hash.each do |key, value|
  puts "Key: #{key}, Value: #{value}"
end

if my_hash.has_key?("fruits")
  puts "The key 'fruits' exists in the hash."
end