從哈希

的陣列

我的散列的數組類似於刪除零值：從哈希

[ 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!107", :name=>"Folder 11", :type=>"folder"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!105", :name=>"Pictures", :type=>"album"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!113", :name=>"Public", :type=>"folder"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!124", :name=>"sasd", :type=>"folder"}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil}, 
    {:id=>nil, :name=>nil, :type=>nil} 
]

如何刪除nil值，如果在我的哈希id是nil？

來源

2015-07-20 Neha

請編輯澄清（即使您選擇了答案，因爲很多人將來可能會閱讀您的問題）。「如果我的散列'id'爲'nil'，我怎麼能刪除'nil'值？沒有任何意義，你可以在不刪除鍵的情況下刪除值，也許你的意思是你想刪除所有散列'h'，其中'h [：id] .nil？＃=> true'？如果是這樣的話（如果你的數組是'a'，你想修改'a'還是返回一個等於'a'的數組，元素被刪除？），準確地說Ruby是所有的東西！ –

您可以使用reject：

arr.reject{|h| h[:id].nil?} 

=> [{:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!107", :name=>"Folder 11", :type=>"folder"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!105", :name=>"Pictures", :type=>"album"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!113", :name=>"Public", :type=>"folder"}, 
    {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!124", :name=>"sasd", :type=>"folder"}]

Demo

或者select：

arr.select { |h| h[:id] }

Demo

來源

2015-07-20 06:04:08 potashin

我假設你想獲得其值不都所有哈希。你可以這樣做：

arr = [{:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!107", :name=>"Folder 11", :type=>"folder"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!105", :name=>"Pictures", :type=>"album"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!113", :name=>"Public", :type=>"folder"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!124", :name=>"sasd", :type=>"folder"}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}, {:id=>nil, :name=>nil, :type=>nil}] 

arr.find_all { |h| !h.values.compact.empty? } 
# => [{:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!107", :name=>"Folder 11", :type=>"folder"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!105", :name=>"Pictures", :type=>"album"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!113", :name=>"Public", :type=>"folder"}, {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!124", :name=>"sasd", :type=>"folder"}]

來源

2015-07-20 06:04:16 shivam

你想使用select method過濾數組。

list = list.select { |item| item[:id] != nil }

來源

2015-07-20 06:06:54 Travis

如果您關注的是除去元素，其哈希id是nil則最好使用delete_if

array.delete_if { |h| h[:id].nil? } 
=> [ 
     {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!107", :name=>"Folder 11", :type=>"folder"}, 
     {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!105", :name=>"Pictures", :type=>"album"}, 
     {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!113", :name=>"Public", :type=>"folder"}, 
     {:id=>"folder.cecb8eb83d90dbeb.CECB8EB83D90DBEB!124", :name=>"sasd", :type=>"folder"} 
    ]

注：reject會返回一個新陣列包含的項目在self中，給定的塊不是true。而delete_if將刪除self的每個元素，其塊評估爲true。

來源

2015-07-20 06:22:13

回答

相關問題