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如何检查数组中的对象id是否相同?

ecmascript-6 typescript arrays javascript

-1

Sireini · 技术社区 · 7 年前

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。

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}}
]

所以基本上我有一个 orderID 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});
   }
}

index 当我两次添加第三道菜时返回-1,如下所示:

dish = {id: 3, quantity: 2}

而orders数组如下所示:

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

谁能帮帮我吗我很感激:)

2 回复 | 直到 7 年前

1

0

Jonas Wilms 7 年前

e.id 是您可能想要的订单id e.dish.id .

2

-1

Shidersz 7 年前

dish.id 属性已存在,您的实际代码与 order id . 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, dish: {id:1, quantity: 1}},
    {id: 1, dish: {id:3, quantity: 2}}
];

let orderCounter = 1;

function addToCart(dish)
{
   const index = orders.findIndex(({dish:{id}}) => id === dish.id);

   if (index >= 0)
   {
      orders[index].dish = dish;
   }
   else
   {
      orders.push({id: ++orderCounter, dish: dish});
   }
}

addToCart({id: 3, quantity: 5});
addToCart({id: 7, quantity: 3});
console.log(orders);