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 -->
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论