在反应中返回嵌套循环内的所有对象

Question

I want return all objects inside nested loop

const data = [{ id:1, products:[{id:1, name:'apple'}, {id:2, name:'orange'}] },
{id:2, products:[{id:3, name:'grapes'}, {id:4, name:'banana'},  {id:5, name:'dragonFruit'}] 
}]
 let result = data.map(item=>{
 item?.products?.map(row=> return row) })
console.log(result )

result should be:

[{id: 1, name: 'apple'}
{id: 2, name: 'orange'}
{id: 3, name: 'grapes'}
{id: 4, name: 'banana'}
{id: 5, name: 'dragonFruit'}
]

Answer 1

 const data = [{ id:1, products:[{id:1, name:'apple'}, {id:2, name:'orange'}] }, {id:2, products:[{id:3, name:'grapes'}, {id:4, name:'banana'}, {id:5, name:'dragonFruit'}] }] let result = data.map(item=>{ let res = item.products.map((val) =>{ return val }) return res }) console.log(result)

check the above snippet, here inner map function return the value to the outer map and from the outer map function I'm returning the result

Answer 2

It is possible to use flatMap with map .

let result = data.flatMap(({products})=> 
    products.map(prd=> ({...prd })))

Let me show an example:

 const data = [ { id:1, products:[ {id:1, name:'apple'}, {id:2, name:'orange'} ] }, {id:2, products:[ {id:3, name:'grapes'}, {id:4, name:'banana'}, {id:5, name:'dragonFruit'} ] } ] let result = data.flatMap(({products})=> products.map(prd=> ({ ...prd }))) console.log(result)

Answer 3

You can use the flatMap . Read more about it at here

 const data = [ { id:1, products:[{id:1, name:'apple'}, {id:2, name:'orange'}] }, { id:2, products:[{id:3, name:'grapes'}, {id:4, name:'banana'}, {id:5, name:'dragonFruit'}] } ]; const flatResult = data.flatMap(({products})=> products); console.log(flatResult)

The above will return the output as

[
  {
    "id": 1,
    "name": "apple"
  },
  {
    "id": 2,
    "name": "orange"
  },
  {
    "id": 3,
    "name": "grapes"
  },
  {
    "id": 4,
    "name": "banana"
  },
  {
    "id": 5,
    "name": "dragonFruit"
  }
]

Answer 4

You can do it using a nested loop, first map over the data and then over the products .

 const data = [ { id: 1, products: [ { id: 1, name: "apple" }, { id: 2, name: "orange" }, ], }, { id: 2, products: [ { id: 3, name: "grapes" }, { id: 4, name: "banana" }, { id: 5, name: "dragonFruit" }, ], }, ]; function App() { return ( <ul> {data.map(({ products }) => products.map((p) => <li key={p.id}>{p.name}</li>) )} </ul> ); } const root = ReactDOM.createRoot(document.getElementById("root")); root.render(<App />);

 <script crossorigin src="https://unpkg.com/react@18/umd/react.development.js"></script> <script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script> <div id="root"></div>