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基于特定条件查找键的计数:javascript

underscore.js javascript

user6202450 · 技术社区 · 8 年前

我想答案是 Access / process (nested) objects, arrays or JSON 与我想要实现的目标不同。上面链接了有关从嵌套数组集访问对象的问题。

我有一个对象数组,如下所示

[
 {
   "type": "type 1",
   "status": "success"
 },
 {
   "type": "type 2",
   "status": "success"
 },
 {
   "type": "type 1",
   "status": "error"
 },
 {
   "type": "type 1",
   "status": "success"
 }
]

我想得到的是这样的东西

 2 type 1 has an event success
 1 type 1 has an event error
 1 type 2 has an event success

基本上,我想要状态为成功和错误的类型的计数。

强调js在这里可能有用,但我无法做到这一点。帮助将不胜感激谢谢

1 回复 | 直到 7 年前

K D 8 年前

请尝试以下操作,您可以使用 _.countBy

var arr = [
 {
   "type": "type 1",
   "status": "success"
 },
 {
   "type": "type 2",
   "status": "success"
 },
 {
   "type": "type 1",
   "status": "error"
 },
 {
   "type": "type 1",
   "status": "success"
 }
];

var res = _.countBy(arr,function(obj){
return obj.type + " has an event " + obj.status
});

for(var item in res)
{
   console.log(res[item] + " " + item);
}