JavaScript對象按屬性分組並推送到新對象

-1

我需要幫助閱讀對象，按名稱分組並計算每次出現次數。JavaScript對象按屬性分組並推送到新對象

然後我需要將結果推送到另一個對象，我可以用handlebars迭代。

這裏是我的樣本對象：

var names = [ 
{ "name": "Person A" }, 
{ "name": "Person B" }, 
{ "name": "Person C" }, 
{ "name": "Person D" }, 
{ "name": "Person B" }, 
{ "name": "Person C" }, 
{ "name": "Person B" } 
];

我已經發現了一些代碼將遍歷並從中總結出名字：

 for(var i = 0; i < names.length; i++) { 

      if(!count[names[i].name]){ 
       count[names[i].name] = 0;      
      } 
      count[names[i].name]++; 
     }

使我有以下幾點：

我需要將這些結果推送到一個新的對象f或把手來閱讀。所以，我需要的數據是這種格式：

這是我已經成功至今，我掙扎的數據推到我的反應對象作爲新項目。我不知道如何從count對象中檢索名稱和總數。

// Set up the data to be returned 
var names = [ 
{ "name": "Person A" }, 
{ "name": "Person B" }, 
{ "name": "Person C" }, 
{ "name": "Person D" }, 
{ "name": "Person B" }, 
{ "name": "Person C" }, 
{ "name": "Person B" } 
]; 
var count = {}; 
var response = { items:[] }; 



     for(var i = 0; i < names.length; i++) { 

      if(!count[names[i].name]){ 
       count[names[i].name] = 0;      
      } 
      count[names[i].name]++; 
     }    


// Loop through the count object and populate response items 
for(var key in count) { 

    response.items.push({ 
      // How do i put the name and total here? 
      "name": "Person A", 
      "total": 12345 
    }); 
} 


console.log(count); 
console.log(response);

來源

2017-05-08 Scott

這是你所期望的嗎？

for (var key in count) { 
    response.items.push({ 
     "name": key, 
     "total": count[key] 
    }); 
}

來源

2017-05-08 16:20:40

是的，這是完美的，太感謝你了 – Scott

你可以這樣做：使用forin循環像下面。

var names = [{ 
 
    "name": "Person A" 
 
    }, 
 
    { 
 
    "name": "Person B" 
 
    }, 
 
    { 
 
    "name": "Person C" 
 
    }, 
 
    { 
 
    "name": "Person D" 
 
    }, 
 
    { 
 
    "name": "Person B" 
 
    }, 
 
    { 
 
    "name": "Person C" 
 
    }, 
 
    { 
 
    "name": "Person B" 
 
    } 
 
]; 
 

 
var count = {}; 
 
for (var i = 0; i < names.length; i++) { 
 

 
    if (!count[names[i].name]) { 
 
    count[names[i].name] = 0; 
 
    } 
 
    count[names[i].name]++; 
 
} 
 

 
var res = []; 
 
for(var i in count) { 
 
    if(count.hasOwnProperty(i)) { 
 
    res.push({name:i, total:count[i]}); 
 
    } 
 
} 
 
console.log(res);

來源

2017-05-08 16:22:39

const names = [ 
 
{ "name": "Person A" }, 
 
{ "name": "Person B" }, 
 
{ "name": "Person C" }, 
 
{ "name": "Person D" }, 
 
{ "name": "Person B" }, 
 
{ "name": "Person C" }, 
 
{ "name": "Person B" } 
 
] 
 

 
const count = names.reduce((count, item) => (
 
    count[item.name] 
 
    ? count[item.name]++ 
 
    : count[item.name] = 1 
 
    , count) 
 
, {}) 
 

 
const result = Array.from(Object.keys(count), (key) => ({ name: key, total: count[key] })) 
 

 
console.log(result)

來源

2017-05-08 16:27:58 marzelin

JavaScript對象按屬性分組並推送到新對象

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