Question

我有下面的对象，可以有很多职业水平（我现在已经显示了2个）：

    var input =
       {

       "careerLevel": "Associate",
       "careerLevels": [
           {
               "201609": 21,
               "201610": 22,
               "201611": 23,
               "careerID": "10000120"
           },
           {
               "201609": 31,
               "201610": 32,
               "201611": 33,
               "careerID": "10000130"
           }]
   };

我想检查 careerID 属性，我需要提取具有 careerID 值最高的元素。因此，在这种情况下，输出将如下所示：

var output=  {"201609": 31,
               "201610": 32,
               "201611": 33}

我的尝试如下：

var res = Math.max.apply(Math, oldArr.careerLevels.map(function (o) { return o.careerID; })) // This gives me the highest careerID value

var highestOrderArr = oldArr.careerLevels.filter(element => { 
                // i think here i need to make a check for the comparison
});

Answer 1

另一种方法是排序并获取最后一个对象。

＆＃13;

var input = {  "careerLevel": "Associate",  "careerLevels": [{      "201609": 21,      "201610": 22,      "201611": 23,      "careerID": "10000120"    },    {      "201609": 31,      "201610": 32,      "201611": 33,      "careerID": "10000130"    }  ]},
    highest = input.careerLevels.sort((a, b) => a.careerID - b.careerID).pop();

console.log(highest);

＆＃13;

.as-console-wrapper { max-height: 100% !important; top: 0; }

＆＃13;

使用函数reduce

＆＃13;

var input = {  "careerLevel": "Associate",  "careerLevels": [{      "201609": 21,      "201610": 22,      "201611": 23,      "careerID": "10000120"    },    {      "201609": 31,      "201610": 32,      "201611": 33,      "careerID": "10000130"    }  ]},
    highest = input.careerLevels.reduce((a, c) => c.careerID > a.careerID ? c : a, {careerID: Number.MIN_SAFE_INTEGER});

console.log(highest);

＆＃13;

.as-console-wrapper { max-height: 100% !important; top: 0; }

＆＃13;

Answer 2

我们可以使用reduce来获得最高careerID并输出该对象。

＆＃13;

var input ={
   "careerLevel": "Associate",
   "careerLevels": [
       {
           "201609": 21,
           "201610": 22,
           "201611": 23,
           "careerID": "10000120"
       },
       {
           "201609": 31,
           "201610": 32,
           "201611": 33,
           "careerID": "10000130"
       }]
};
   
const out = input.careerLevels.reduce((prev, current) => {
    return (prev.careerID > current.careerID) ? prev : current
}, false)

console.log(out);

＆＃13;

提取具有最高属性值的元素

2 个答案: