过滤Jquery数组中的数据并按键计数答案

【问题标题】：Filter data in Jquery array and count by key过滤Jquery数组中的数据并按键计数
【发布时间】：2021-05-08 19:20:29
【问题描述】：

var newly = [
                {"id":"15","cm_id":"31","name":"nims","total":1},
                {"id":"15","cm_id":"61","name":"bims forum",,"total":3},
                {"id":"80","cm_id":"198","name":"rims for topic",,"total":2}
                ];

我想按 id 过滤上面的数组过滤器并找到总值的计数例如：id-> 总共 15 个 -> 4

请建议如何使用 filter 和 reduce 一起按 id 对数组进行排序并计算每个 id 的总数。

【问题讨论】：

标签： jquery filter

【解决方案1】：

使用您将 id 值设置为键并将总和设置为值的对象

var newly = [
                {"id":"15","cm_id":"31","name":"nims","total":1},
                {"id":"15","cm_id":"61","name":"bims forum","total":3},
                {"id":"80","cm_id":"198","name":"rims for topic","total":2}
                ];
                
 var idTotals = {};
 
 newly.forEach(({id, total}) => idTotals[id] = (idTotals[id] || 0) + total)
 
 console.log(idTotals)

【讨论】：

【解决方案2】：

你可以试试这个方法

var totalCount = {};
var newly = [
                {"id":"15","cm_id":"31","name":"nims","total":1},
                {"id":"15","cm_id":"61","name":"bims forum","total":3},
                {"id":"80","cm_id":"198","name":"rims for topic","total":2}
            ];

for(const {id,total} of newly) {
    totalCount[id] = (id in totalCount) ? totalCount[id]+=total : total
}  

for(const id in totalCount){
    console.log(`id-> ${id} total -> ${totalCount[id]}`)
}

【讨论】：