[英]How to treat an Array with two elements as-like a Hash key / value pair?
我正在使用Ruby on Rails 3.2.2。 我有以下場景:
# hash_params.class
# => Hash
# hash_params.inspect
# => { :key1 => :value1, :key2 => value2, ... => ... }
#
def self.method_1(hash_params)
hash_params.each do { |hash_param| self.method_2(hash_param) }
end
# param.class
# => Array
# param.inspect
# => [:key1, value1] # or '[:key2, value2]' or '[..., ...]', depending on cases.
#
def self.method_2(param)
logger.debug "Key => #{param[0])"
logger.debug "Value => #{param[1])"
end
鑒於在上面的代碼中注釋掉的輸出,當我運行method_1
然后在logger文件中我有以下內容:
Key => :key1
Value => :value1
Key => :key2
Value => :value2
Key => ...
Value => ...
我想將method_2
的param
變量視為一個鍵/值對 ( 而不是數組),例如通過制作類似下面的內容
def self.method_2(param)
param do |key, value| # Note: This code line doesn't work. It is just a sample code to clarify the question.
logger.debug "Key => #{key.inspect)"
logger.debug "Value => #{value.inspect)"
end
end
? 可能嗎? 如果是這樣,怎么樣? 你有什么建議?
使用Hash[]
:
param = [:key1, 'value1']
h = Hash[*param]
puts h[:key1]
輸出:
值1
怎么樣
def self.method_1(hash_params)
hash_params.each do { |key, value| self.method_2(key, value) }
end
def self.method_2(key, value)
logger.debug "Key => #{key)"
logger.debug "Value => #{value)"
end
否則你仍然可以在param中傳遞一個哈希值
def self.method_1(hash_params)
hash_params.keys.each do { |key| self.method_2(hash_params.slice(key)) }
end
編輯 :如果你想要一個哈希作為參數你可以做
def self.method_1(hash_params)
hash_params.each do { |key, value| self.method_2({key => value}) }
end
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