Question

我正在研究一个小型的React项目，但现在我陷入了困境。我需要根据数组对象键进行分组。

下面是数组：

   let addOnFeatures = [
    {"name": "feature1", id: 101, cost: 100},
    {"name": "feature2", id: 102, cost: 200},
    {"name": "feature1", id: 103, cost: 300},
    {"name": "feature3", id: 104, cost: 40}
    ]

我需要根据名称键进行分组，以便每个与通用名称相关的ID都应显示在其自己的标签上。

预期输出应为

*uniqueFeaturename
id: cost

示例：

 1. feature1
   101 : 100
   103 : 300
 2. feature2
    102 : 200
 3. feature3
    104: 40

Answer 1

只需使用Array.prototype.reduce并向对象添加元素，如

let addOnFeatures = [
    {"name": "feature1", id: 101, cost: 100},
    {"name": "feature2", id: 102, cost: 200},
    {"name": "feature1", id: 103, cost: 300},
    {"name": "feature3", id: 104, cost: 40}
]

const res = addOnFeatures.reduce((acc, item) => {
   if(acc[item.name]) {
      acc[item.name] = {...acc[item.name], [item.id]: item.cost};
   } else {
      acc[item.name] = {[item.id]: item.cost};
   }
   return acc;
}, {});

console.log(res);

Answer 2

一个解决方案可以是：

 let addOnFeatures = [
    {"name": "feature1", id: 101, cost: 100},
    {"name": "feature2", id: 102, cost: 200},
    {"name": "feature1", id: 103, cost: 300},
    {"name": "feature3", id: 104, cost: 40}
    ];
    
    var res={}; 
    addOnFeatures.forEach(i=>{
    
       if(!res[i.name]){
         res[i.name] = [{id: i.id, cost:i.cost}]
       }else{
        res[i.name].push({id: i.id, cost:i.cost})
       }
    }
    );
    
    console.log(res)

或者这个

 let addOnFeatures = [
    {"name": "feature1", id: 101, cost: 100},
    {"name": "feature2", id: 102, cost: 200},
    {"name": "feature1", id: 103, cost: 300},
    {"name": "feature3", id: 104, cost: 40}
    ];
    
   var res2={}; 
    addOnFeatures.forEach(i=>{
        res2[i.name] = res2[i.name] ? [...res2[i.name],...[{id: i.id, cost:i.cost}]] :[...[{id: i.id, cost:i.cost}]]
    }
    );
    
    console.log(res2)

根据对象数组中的唯一键进行分组

2 个答案: