Javascript 如何检查数组中的对象id是否相同？

我想将一个对象id与数组中对象的所有id进行比较

因此，我有一个按钮，可以将一道菜添加到订单数组中。当它不在数组中时，将其推送到数组中。但是当它确实存在时，用新的dish对象替换当前的

它看起来像这样：

const dish = {id:1, quantity: 4};

// This will be filled by an array push
const orders = [
  {id: 1, dish: {id:1, quantity: 1}},
  {id: 2, dish: {id:3, quantity: 5}},
  {id: 3, dish: {id:5, quantity: 1}},
  {id: 4, dish: {id:2, quantity: 3}},
  {id: 5, dish: {id:8, quantity: 1}}
]

dish = {id: 3, quantity: 2}

const orders = [
  {id: 0, dish: {id:1, quantity: 1}},
  {id: 1, dish: {id:3, quantity: 2}},
  {id: 2, dish: {id:3, quantity: 2}},
]

所以基本上我有一个

orderID

和一个

dishID

我所尝试的：

addToCart(dish){

  const index = this.orders.findIndex((e) => e.id === dish.id);

   if(index >= 0){
      console.log('INDEX1', this.orders, index);
      this.orders[index] = {id: this.orders[index].id, dish: this.orders[index].dish};
   } else {
      this.orderCounter = this.orderCounter + 1;
      this.orders.push({id: this.orderCounter, dish: dish});
   }
}

当我两次添加第三道菜时，

索引返回-1，如下所示：

const dish = {id:1, quantity: 4};

// This will be filled by an array push
const orders = [
  {id: 1, dish: {id:1, quantity: 1}},
  {id: 2, dish: {id:3, quantity: 5}},
  {id: 3, dish: {id:5, quantity: 1}},
  {id: 4, dish: {id:2, quantity: 3}},
  {id: 5, dish: {id:8, quantity: 1}}
]

dish = {id: 3, quantity: 2}

const orders = [
  {id: 0, dish: {id:1, quantity: 1}},
  {id: 1, dish: {id:3, quantity: 2}},
  {id: 2, dish: {id:3, quantity: 2}},
]

而orders数组如下所示：

const dish = {id:1, quantity: 4};

// This will be filled by an array push
const orders = [
  {id: 1, dish: {id:1, quantity: 1}},
  {id: 2, dish: {id:3, quantity: 5}},
  {id: 3, dish: {id:5, quantity: 1}},
  {id: 4, dish: {id:2, quantity: 3}},
  {id: 5, dish: {id:8, quantity: 1}}
]

dish = {id: 3, quantity: 2}

const orders = [
  {id: 0, dish: {id:1, quantity: 1}},
  {id: 1, dish: {id:3, quantity: 2}},
  {id: 2, dish: {id:3, quantity: 2}},
]

有人能帮我吗？我很感激：）
e.id
是订单id，您可能需要
e.dish.id
您需要搜索一个对象，该对象的
dish.id
属性已经存在，您的实际代码与
订单id
进行比较。此外，我还做了一些其他小改动来修复您的代码，请检查以下内容：


const orders=[
{id:0，盘：{id:1，数量：1}，
{id:1，碟：{id:3，数量：2}
];
让orderCounter=1；
函数addToCart（dish）
{
const index=orders.findIndex（（{dish:{id}}）=>id==dish.id）；
如果（索引>=0）
{
订单[索引].dish=dish；
}
其他的
{
push（{id:++orderCounter，dish:dish}）；
}
}
addToCart（{id:3，数量：5}）；
addToCart（{id:7，数量：3}）；
控制台日志（订单）它必须是数组吗？为什么不是一个
Set（）
而不用担心这个订购层呢？请告诉我我的答案有什么问题，这样我就可以改进它或删除它，谢谢！