如何检查相同的属性存在于单个对象数组 javascript 中

Question

我想知道对象数组在 javascript

中是否具有相同的属性值

为数组对象list1,

if name and country has same value, return true

if name same, any object country has value SG return true

if above two conditions fails, return false

var list1=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "IN"}
]
const result1=checkObj(list1);

var list2=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "SG"}
]
const result2=checkObj(list2);

var list3=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "TH"}
]
const result3=checkObj(list3);
Expected Result:
//when passing list1
true
//when passing list2
true
//when passing list3
false

Answer 1

试试这个，

var list1=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "IN"}
]
const result1=checkObj(list1);

console.log(result1);

var list2=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "SG"}
]
const result2=checkObj(list2);

console.log(result2);

var list3=[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "TH"}
]
const result3=checkObj(list3);

console.log(result3);

function checkObj(list){
  for(i=0;i<list.length;i++)
  {  
   for(j=0;j<list.length;j++)
    {
      if(j!=i){
        if(list[i].name==list[j].name){
          if(list[i].country==list[j].country || list[i].country =='SG'){
          return true;
          }
        }
      }
    }
  }
  return false;
}

Answer 2

在下面的代码片段中，我汇总了一种基于对数组的所有元素进行单循环的方法。 name/country 组合的出现被收集在本地对象 o 中，并在函数结束时进行检查。

const data=[[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "IN"}
],[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "SG"},
  {id:1, name: "sen", country: "DN"},
  {id:1, name: "sen", country: "EN"}
],[
  {id:1, name: "sen", country: "IN"},
  {id:2, name: "sen", country: "TH"}
]];

function dupes(arr){
  const o={}, // object o counts all occurrences
    // the sort makes sure the "SG" items come last in ar
    ar= arr.slice(0).sort((a,b)=>a.country==="SG" ? (b.country==="SG" ? 0 : 1) : -1);
  // a single loop over ar:
  ar.forEach(e=>{
   if(e.country!=="SG"){ // "normal" countries:
    let k=e.name+"|"+e.country;
    o[k]=(o[k]||0)+1
   } else {  // for country=="SG"
    for (let k in o)
     if (k.indexOf(e.name+"|")==0)
       o[k]++ // increase counts for all elements starting with <el.name>|
   }
  });
  return Object.values(o).some(n=>n>1)
   
}

data.forEach(d=>console.log(dupes(d)))

如何检查相同的属性存在于单个对象数组 javascript 中

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如何检查相同的属性存在于单个对象数组 javascript 中