如何在JavaScript中获取嵌套数组对象

Question

我想知道如何根据javascript中的条件进行过滤。 如果存在min且amt > min ，则获取whole obj ， remove that particular object in the obj

function getItem(obj){
  return
   obj.filter(e=>e.hasOwnProperty("min")?e.amt>e.min:e);

}
var obj1=[{
  "id": "name",
  "min": 300,
  "amt": 200,
  "cn" : "SG"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
}]
var obj2=[{
  "id": "name",
  "min": 300,
  "amt": 500,
  "cn" : "SG"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
}]

预期输出：var result = getItem（obj1）;

[{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
}]

var result = getItem（obj2）;

[{
  "id": "name",
  "min": 300,
  "amt": 500,
  "cn" : "SG"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
},{
  "id": "others",
  "amt": 200,
  "cn" : "TH"
}]

Answer 1

检查min存在，如果不返回，则检查其是否大于amt 。

 var obj1 = [{ "id": "name", "min": 300, "amt": 200, "cn": "SG" }, { "id": "others", "amt": 200, "cn": "TH" }, { "id": "others", "amt": 200, "cn": "TH" }] var obj2 = [{ "id": "name", "min": 300, "amt": 500, "cn": "SG" }, { "id": "others", "amt": 200, "cn": "TH" }, { "id": "others", "amt": 200, "cn": "TH" }]; const res1 = obj1.filter(({ min, amt }) => { return !min || (amt > min); }); console.log(res1); const res2 = obj2.filter(({ min, amt }) => { return !min || (amt > min); }); console.log(res2); 

Answer 2

如果我正确理解了您的问题，则仅当对象包含min ，才希望应用条件amt > min min 。 如果对象不包含min ，则返回整个对象。

在这种情况下， getItem应该如下所示：

const getItem = arrayOfObjects => arrayOfObjects.filter(obj => {
    if (obj['min']) {
        if (obj['amt'] > obj['min']) return true
    } else {
        return true
    }
}) 

Answer 3

这是我尝试过的一种解决方案

 function getItem(obj) { return !('min' in obj) || obj.amt>obj.min ; } var obj1 = [{ "id": "name", "min": 300, "amt": 200, "cn": "SG" }, { "id": "others", "amt": 200, "cn": "TH" }, { "id": "others", "amt": 200, "cn": "TH" }] var obj2 = [{ "id": "name", "min": 300, "amt": 500, "cn": "SG" }, { "id": "others", "amt": 200, "cn": "TH" }, { "id": "others", "amt": 200, "cn": "TH" }] var result1 = obj1.filter(getItem); var result2 = obj2.filter(getItem); console.log('result1',result1); console.log('result2',result2);