如何移动嵌套数组中的元素

我想移动嵌套数组中的元素。所以，这是我的数据：

let products = [
    {     
      "product_name": "A",
      "_id": "5ace995c14a759325776aab1",
      "transactions": [
        {
          "_id": "5ad3a274ac827c165a510f99",
          "qty": 100,
          "price": 2000
        },
        {
          "_id": "5ad3a274ac827c165a510f99",
          "qty": 80,
          "price": 1500
        },
      ]
    },
    {
      "product_name": "B",
      "_id": "5ace995914a759325776aab0",
      "transactions": [
        {
          "_id": "5ad3a274ac827c165a510f9b",
          "qty": 80,
          "price": 1500
        }
      ],
    }
  ]

我期望的输出：

[
  {
    "_id": "5ad3a274ac827c165a510f99",
    "qty": 100,
    "price": 2000,
    "product_name": "A",
  },
  {
    "_id": "5ad3a274ac827c165a510f99",
    "qty": 80,
    "price": 1500,
    "product_name": "A",
  },
  {
    "_id": "5ad3a274ac827c165a510f9b",
    "qty": 80,
    "price": 1500,
    "product_name": "B",
  }
]

然后，我的解决代码：

function move() {
  var result = []
  for (product of products) {
    for (transaction of product.transactions) {
      transaction.product_name = product.product_name
      result.push(transaction)
    }
  }
  return result
}
product = move()

有没有有效的方法来创建输出，也许使用数组映射或其他东西？谢谢。

你可以把transactions with Array#reduce并使用Object.assign用于添加product_name.

还使用：

• 解构赋值对于属性和

• 速记属性用于将变量作为属性并以名称作为键。

var products = [{ product_name: "A", _id: "5ace995c14a759325776aab1", transactions: [{ _id: "5ad3a274ac827c165a510f99", qty: 100, price: 2000 }, { _id: "5ad3a274ac827c165a510f99", qty: 80, price: 1500 }] }, { product_name: "B", _id: "5ace995914a759325776aab0", transactions: [{ _id: "5ad3a274ac827c165a510f9b", qty: 80, price: 1500 }] }],
    result = products.reduce((r, { transactions, product_name }) =>
        r.concat(transactions.map(t => Object.assign({}, t, { product_name }))),
        []
    );
  
console.log(result);

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