在Ruby中解析哈希

hash = { "key1" => "value1", "key2" => "value2" }
hash.each do |key, value|
  puts "#{key}: #{value}"
end

key1: value1
key2: value2

hash = { "key1" => "value1", "key2" => "value2" }
puts hash["key1"] # 输出：value1

hash = { "key1" => "value1", "key2" => "value2" }
puts hash.fetch("key3", "default") # 输出：default

hash = { "key1" => "value1", "key2" => "value2" }
keys = hash.keys
puts keys.inspect # 输出：["key1", "key2"]

hash = { "key1" => "value1", "key2" => "value2" }
values = hash.values
puts values.inspect # 输出：["value1", "value2"]

hash1 = { "key1" => "value1" }
hash2 = { "key2" => "value2" }
merged_hash = hash1.merge(hash2)
puts merged_hash.inspect # 输出：{"key1"=>"value1", "key2"=>"value2"}