比较两个数组并将对象添加到另一个数组

debugcn 发表于 Dev

emi

我有两个数组：

let array1 = [
  {
    _id: '5eaf8eeac436dbc9b7d75f35',
    name: 'Strawberry',
    category: 'organic',
    image: '/productImages/australian.jpg',
    price: '9.65',
    quantity: 1
  },
  {
    _id: '5eaf8f61c436dbc9b7d75f36',
    name: 'Organic Wild Blue Berry',
    category: 'organic',
    image: '/productImages/owbb.jpg',
    price: '12.50',
    quantity: 1
  },
  {
    _id: '5eb0ac47d98c817d9a82df82',
    name: 'Mango',
    category: 'australian',
    image: '/productImages/australian.jpg',
    price: '12.25',
    quantity: 1
  },
  {
    _id: '5eb0ac71d98c817d9a82df83',
    name: 'Peas',
    category: 'conventional',
    image: '/productImages/owbb.jpg',
    price: '25.12',
    quantity: 1
  }
]

let array2 = [
  {
    _id: '5ec00539f7ff70566fd8a557',
    productid: {
      _id: '5eaf8eeac436dbc9b7d75f35',
      name: 'Strawberry',
      category: 'organic',
      image: '/productImages/australian.jpg',
      price: '9.65'
    },
    quantity: 3
  },
  {
    _id: '5ec00539f7ff70566fd8a558',
    productid: {
      _id: '5eaf8f61c436dbc9b7d75f36',
      name: 'Organic Wild Blue Berry',
      category: 'organic',
      image: '/productImages/owbb.jpg',
      price: '12.50'
    },
    quantity: 3
  }
]

我需要检查productId的array2任何对象匹配_id的array1。如果是这样，我需要将每个对象的数量彼此相加。否则，我需要互相推销。

例如，如果"_id": "5eb0ac71d98c817d9a82df83"在任何对象不存在array2的productId，将其推入array2。如果其中array2不存在任何元素，请将其array1推入array1。

如果其中一个对象包含在另一个数组中，我设法更新了数量，但无法找出一种将其余对象彼此推到一起的方法。

这是我将匹配数量_id从合并array1到productId的方式array2

if (array1.length > 0) {
  for (let i = 0; i < array2.length; i++) {
    for (let k = 0; k < array1.length; k++) {
      if (array2[i].productid._id === array1[k]._id) {
        array1[k].quantity = array1[k].quantity + array2[i].quantity
        array2[i].quantity = array1[k].quantity
      }
    }
  }
}

根据以上示例的预期结果：

array1 = [
  {
    _id: '5eaf8eeac436dbc9b7d75f35',
    name: 'Strawberry',
    category: 'organic',
    image: '/productImages/australian.jpg',
    price: '9.65',
    quantity: 4
  },
  {
    _id: '5eaf8f61c436dbc9b7d75f36',
    name: 'Organic Wild Blue Berry',
    category: 'organic',
    image: '/productImages/owbb.jpg',
    price: '12.50',
    quantity: 4
  },
  {
    _id: '5eb0ac47d98c817d9a82df82',
    name: 'Mango',
    category: 'australian',
    image: '/productImages/australian.jpg',
    price: '12.25',
    quantity: 1
  },
  {
    _id: '5eb0ac71d98c817d9a82df83',
    name: 'Peas',
    category: 'conventional',
    image: '/productImages/owbb.jpg',
    price: '25.12',
    quantity: 1
  }
]

array2 = [
  {
    _id: '5ec00539f7ff70566fd8a557',
    productid: {
      _id: '5eaf8eeac436dbc9b7d75f35',
      name: 'Strawberry',
      category: 'organic',
      image: '/productImages/australian.jpg',
      price: '9.65'
    },
    quantity: 4
  },
  {
    _id: '5ec00539f7ff70566fd8a558',
    productid: {
      _id: '5eaf8f61c436dbc9b7d75f36',
      name: 'Organic Wild Blue Berry',
      category: 'organic',
      image: '/productImages/owbb.jpg',
      price: '12.50'
    },
    quantity: 4
  },
  {
    _id: 'auto-generated-id',
    productid: {
      _id: '5eb0ac47d98c817d9a82df82',
      name: 'Mango',
      category: 'australian',
      image: '/productImages/australian.jpg',
      price: '12.25'
    },
    quantity: 1
  },
  {
    _id: 'auto-generated-id',
    productid: {
      _id: '5eb0ac71d98c817d9a82df83',
      name: 'Peas',
      category: 'conventional',
      image: '/productImages/owbb.jpg',
      price: '25.12'
    },
    quantity: 1
  }
]

苦

您可以通过reduce功能来做到这一点。这是我的尝试：

var array1 =[{"_id":"5eaf8eeac436dbc9b7d75f35","name":"Strawberry","category":"organic","image":"/productImages/australian.jpg","price":"9.65","quantity":1},{"_id":"5eaf8f61c436dbc9b7d75f36","name":"Organic Wild Blue Berry","category":"organic","image":"/productImages/owbb.jpg","price":"12.50","quantity":1},{"_id":"5eb0ac47d98c817d9a82df82","name":"Mango","category":"australian","image":"/productImages/australian.jpg","price":"12.25","quantity":1},{"_id":"5eb0ac71d98c817d9a82df83","name":"Peas","category":"conventional","image":"/productImages/owbb.jpg","price":"25.12","quantity":1}];

var array2=[ { _id: '5ec00539f7ff70566fd8a557', productid: { _id: '5eaf8eeac436dbc9b7d75f35', name: 'Strawberry', category: 'organic', image: '/productImages/australian.jpg', price: '9.65', }, quantity: 3 }, { _id: '5ec00539f7ff70566fd8a558', productid: { _id: '5eaf8f61c436dbc9b7d75f36', name: 'Organic Wild Blue Berry', category: 'organic', image: '/productImages/owbb.jpg', price: '12.50', }, quantity: 3 }];


result = array1.reduce((acc, elem, i)=>{
    index = array2.findIndex(val=>val.productid._id == elem._id);
	if(index!=-1) {
	 array2[index].quantity = elem.quantity += array2[index].quantity;
	} else {
	  array2.push({_id:'some_id'+i, productid: elem, quantity: elem.quantity})
	}
    acc.push(elem);
	return acc;
},[]);

result = [...result, ...array2.filter(elem=> !array1.some(val=>val._id == elem.productid._id)).map(({productid, quantity})=>({...productid, quantity}))];


console.log(result);
console.log(array2)

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