使用JavaScript将唯一对象插入对象数组?

问题描述

我正在对对象数组执行推操作.我的代码如下图所示，

I am performing push operation to an array of objects.My code looks similar as shown below,

var obj = {"id":1, "fname":"john", "lname":"doe"};
var userArray = [{
   "id": 1,
   "fname": "john",
   "lname": "doe"
}, {
   "id": 2,
   "fname": "john",
   "lname": "doe"
}];

userArray.forEach(function (element) {
   if(element.id !== obj.id) {
      userArray.push(obj);
   }
});

console.log(userArray);

当我对已经包含一个要推送的对象的userArray进行推送操作时(根据代码为var obj = {"id":1, "fname":"john", "lname":"doe"};)，它将在第二遍for循环中将其推送到数组.

when i do push operation on userArray which already contains an object which i am pushing (from code it is var obj = {"id":1, "fname":"john", "lname":"doe"};) it pushes it to array on second pass in for loop.

预期输出应为userArray = [{"id": 1,"fname": "john","lname": "doe"}, {"id": 2, "fname": "john","lname": "doe"}];

但是我得到了userArray = [{"id": 1,"fname": "john","lname": "doe"}, {"id": 2, "fname": "john","lname": "doe"}, {"id": 1,"fname": "john","lname": "doe"}];

如何仅将唯一对象推送到数组?

How do i push only unique objects to array?

推荐答案

使用数组.some方法检查列表中是否已存在具有该ID的项目.如果没有，则推入数组:

Use the array .some method to check if there is already an item in the list with that ID. If there isn't, then push into the array:

var obj = {"id":1, "fname":"john", "lname":"doe"};
var userArray = [{
   "id": 1,
   "fname": "john",
   "lname": "doe"
}, {
   "id": 2,
   "fname": "john",
   "lname": "doe"
}];

var existing = userArray.some(element => element.id === obj.id);
if(!existing) {
  userArray.push(obj);
}

console.log(userArray);

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