是什麼將這些值轉換從字符串這組數據爲int

Question

這是我的數據集的最佳方式：

data_p = [ 
[ {"key":"Device_Model","value":"test_model"}, 
    {"key":">20MB/30","value":"11"}, 
    {"key":">200MB/30","value":"33"}, 
    {"key":">2048MB/30","value":"10"}, 
    {"key":">5120MB/30","value":"55"}, 
    {"key":">10240MB/30","value":"10"} 
], 
[{"key":"Device_Model","value":"0P6B670"}, 
{"key":">20MB/30","value":"9"}, 
{"key":">200MB/30","value":"8"}, 
{"key":">2048MB/30","value":"2"}, 
{"key":">5120MB/30","value":"23"}, 
{"key":">10240MB/30","value":"23"}], 
[{"key":"Device_Model","value":"0P6B680"}, 
{"key":">20MB/30","value":"1"}, 
{"key":">200MB/30","value":"23"}, 
{"key":">2048MB/30","value":"23"}, 
{"key":">5120MB/30","value":"23"}, 
{"key":">10240MB/30","value":"23"}], 
[{"key":"Device_Model","value":"0P6B810"}, 
{"key":">20MB/30","value":"5"}, 
{"key":">200MB/30","value":"4"}, 
{"key":">2048MB/30","value":"1"}, 
{"key":">5120MB/30","value":"1"}, 
{"key":">10240MB/30","value":"1"}], 
[ {"key":"Device_Model","value":"0P6B900"}, 
{"key":">20MB/30","value":"4"}, 
{"key":">200MB/30","value":"4"}, 
{"key":">2048MB/30","value":"1"}, 
{"key":">5120MB/30","value":"23"}, 
{"key":">10240MB/30","value":"23"}]] 

這是我做的方式，但我想知道的減少，地圖或過濾器一個更好的方法來做到這一點。我的意思是我應該在forEach函數中使用for循環嗎？我也不喜歡這樣，因爲這是非常靜態的，如果數據集中有6個以上的話？

data_p.forEach(function(d){for(i=1; i<6; i++){console.log(d[i].value); d[i].value=+d[i].value}}) 

這會給我：

data_p = [ 
    [ {"key":"Device_Model","value":"test_model"}, 
     {"key":">20MB/30","value":11}, 
     {"key":">200MB/30","value":33}, 
     {"key":">2048MB/30","value":10}, 
     {"key":">5120MB/30","value":55}, 
     {"key":">10240MB/30","value":10} 
    ], 
... 

所以，問題是有沒有更好的方式來實現這一目標？

Answer 1

迭代所有元素。檢查值是數字（isNaN），然後更新屬性

var data_p = [ 
 
[ {"key":"Device_Model","value":"test_model"}, 
 
    {"key":">20MB/30","value":"11"}, 
 
    {"key":">200MB/30","value":"33"}, 
 
    {"key":">2048MB/30","value":"10"}, 
 
    {"key":">5120MB/30","value":"55"}, 
 
    {"key":">10240MB/30","value":"10"} 
 
], 
 
[{"key":"Device_Model","value":"0P6B670"}, 
 
{"key":">20MB/30","value":"9"}, 
 
{"key":">200MB/30","value":"8"}, 
 
{"key":">2048MB/30","value":"2"}, 
 
{"key":">5120MB/30","value":"23"}, 
 
{"key":">10240MB/30","value":"23"}], 
 
[{"key":"Device_Model","value":"0P6B680"}, 
 
{"key":">20MB/30","value":"1"}, 
 
{"key":">200MB/30","value":"23"}, 
 
{"key":">2048MB/30","value":"23"}, 
 
{"key":">5120MB/30","value":"23"}, 
 
{"key":">10240MB/30","value":"23"}], 
 
[{"key":"Device_Model","value":"0P6B810"}, 
 
{"key":">20MB/30","value":"5"}, 
 
{"key":">200MB/30","value":"4"}, 
 
{"key":">2048MB/30","value":"1"}, 
 
{"key":">5120MB/30","value":"1"}, 
 
{"key":">10240MB/30","value":"1"}], 
 
[ {"key":"Device_Model","value":"0P6B900"}, 
 
{"key":">20MB/30","value":"4"}, 
 
{"key":">200MB/30","value":"4"}, 
 
{"key":">2048MB/30","value":"1"}, 
 
{"key":">5120MB/30","value":"23"}, 
 
{"key":">10240MB/30","value":"23"}]] 
 

 

 

 
data_p.forEach(list => 
 
     list.forEach(pair => 
 
      !isNaN(pair.value) && (pair.value = Number(pair.value)) 
 
     ) 
 
); 
 

 
console.log(data_p);

Answer 2

的是這樣做的許多方面。

E.G.使用array.forEach和array.reduce

data_p.forEach(function(a) { 
    a.reduce(function(ignore, obj) { 
     obj.value = Number(obj.value); 
    }); 
}); 

此修改用途減少遍歷所有數組元素除了第一更新到位data_p。它可以擴大檢查轉換爲數字的值是一個數字：

data_p.forEach(function(a) { 
    a.reduce(function(ignore, obj) { 
     var temp = Number(obj.value); 
     if(!isNaN(temp) { 
       obj.value = temp; 
     } 
    }); 
}); 

E.G.使用array.map創建一個新的陣列和陣列內容

var newArray = data_p.map(a => a.map((o,i)=>(
    { key: o.key, 
     value: o.key=="Device_Model" ? o.value : +o.value} 
))); 

不同於第一示例中，這方法不發生變異（在其內或對象）data_p並假定DATA_P包含有效條目。

Answer 3

而不是使用我< 6，爲什麼不d.length？

但是，我不知道什麼是正在完成或爲什麼。最終的結果似乎是，你的代碼值是從字符串轉換爲數字的，但這不是明顯的原因。