英文:
Unnest array of objects contained in object with Javascript
问题
这是我的数据结构。一个包含物品数组的运输数组。我需要有一个包含每个运输物品的数组，并且我需要使用JavaScript来完成这个任务。
这是我想要实现的：
注意： 包含运输的主数组有5000多个元素。
英文:
This is the structure of my data. An array of shipments containing array of items
I need to have an array with entries for each shipment-item and I need to do this with javascript
[
{
"shipmentNumber":12345678,
"items":[
{
"productId":80000000000001,
"price":100,
"quantity":1
},
{
"productId":80000000000002,
"price":80,
"quantity":1
}
]
},
{
"shipmentNumber":89675645,
"items":[
{
"productId":80000000000003,
"price":100,
"quantity":1
}
]
}
]
This is what I want to achieve:
N.B.: The main array containing shipments has 5000+ elements
[
{
"shipmentNumber":12345678,
"items": {
"productId":80000000000001,
"price":100,
"quantity":1
}
},
{
"shipmentNumber":12345678,
"items":
{
"productId":80000000000002,
"price":80,
"quantity":1
}
},
{
"shipmentNumber":89675645,
"items":
{
"productId":80000000000003,
"price":100,
"quantity":1
}
}
]
答案1
得分: 2
使用组合的 flatMap/map 应该能实现您的目标：
result = a.flatMap(
s => s.items.map(
item => ({shipmentNumber: s.shipmentNumber, item})
))
英文:
A combination flatMap/map should do the trick:
result = a.flatMap(
s => s.items.map(
item => ({shipmentNumber: s.shipmentNumber, item})
))
答案2
得分: 1
你可以使用 .map() 方法将每个嵌套数组中所需的数据映射出来，并使用 .flatMap() 方法将结果数组展平为单一数组。
const shipments = [
{
"shipmentNumber": 12345678,
"items": [
{
"productId": 80000000000001,
"price": 100,
"quantity": 1
},
{
"productId": 80000000000002,
"price": 80,
"quantity": 1
}
]
},
{
"shipmentNumber": 89675645,
"items": [
{
"productId": 80000000000003,
"price": 100,
"quantity": 1
}
]
}
];
const result = shipments.flatMap(shipment =>
shipment.items.map(item => ({
shipmentNumber: shipment.shipmentNumber,
item: item
}))
);
console.log(result);
这段代码将嵌套的数据映射为一个单一数组，并打印出结果。
英文:
You can use .map() to map the needed data in each nested array,and .flatMap() method to flatten the result arrays into the single array.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const shipments = [
{
"shipmentNumber":12345678,
"items":[
{
"productId":80000000000001,
"price":100,
"quantity":1
},
{
"productId":80000000000002,
"price":80,
"quantity":1
}
]
},
{
"shipmentNumber":89675645,
"items":[
{
"productId":80000000000003,
"price":100,
"quantity":1
}
]
}
];
const result = shipments.flatMap(shipment =>
shipment.items.map(item => ({
shipmentNumber: shipment.shipmentNumber,
item: item
}))
);
console.log(result);
<!-- end snippet -->
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