Question

我有一群学生，我想创建一个独特的学生阵列。每个学生都有一个唯一的id值，我想与这个id值进行比较。

这是一个Student对象;

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Answer 1

＆＃13;

var Students =[
{
    "id" : "3232aab1"  //some other properties
} ,
{
    "id" : "3232aab1"  //some other properties
}, 
{
    "id" : "3232aab2"  //some other properties
} ,
{
    "id" : "3232aab3"  //some other properties
} ,
{
    "id" : "3232aab2"  //some other properties
} ];

var tmpObj = {};
var uniqArray = Students.reduce(function(acc,curr){
  if (!tmpObj[curr.id]){
    tmpObj[curr.id] = true;
    acc.push(curr)
  }
  return acc;
},[]);
console.log(uniqArray);

＆＃13;

Answer 2

var a=[];
a.push({id:1,name:"something"});
// repeat similar;

访问ID

a[index].id;

要搜索的示例代码

var elem = 1; // id to be searched
//loop
for(var i=0; i<a.length; i++){
  if(elem == a[i].id){
    break;
  }
}
// now a[i] will return the required data {id:1,name:"something"}
// a[i].id = > 1 and a[i].name => something

Answer 3

我可能采取与此类似的方法......

class Students extends Map {
    set(key, value) {
        if (this.has(key)) { throw new Error('Student already there'); }
        return super.set(key, value);
    }
}


const students = new Students();

students.set(1, { name: 'Peter' });

console.log(students.get(1));

// students.set(1, { name: 'Gregor' }); this throws

Answer 4

如果您有下划线，则可以使用以下

ES6 _.uniq(Students, student=>student.id)

ES5 _.uniq(Students, function(student){return student.id;})

如何创建一个以对象为元素的唯一数组？

4 个答案: