copy from one object, change keys but keep the same values

Question

Hi I want to copy a JavaScript object that lives in an external json file. It looks like this:

and via the code I want to change the keys on each array without changing the values of it. The values for the last key needs be an array instead of just vales

{ "items": [
  { "namezz": "Bike", "price": 100 },
  { "namezz": "TV", "price": 700 },
  { "namezz": "Album", "price": 10 },
  { "namezz": "Book", "price": 5 },
  { "namezz": "Phone", "price": 500 },
  { "namezz": "Computer", "price": 1000 },
  { "namezz": "Keyboard", "price": 25 }
]
}

It needs to looks like this:

[
  { "name": "Bike", "data": [100] },
  { "name": "TV", "data": [700] },
  { "name": "Album", "data": [10] },
  { "name": "Book", "data": [5] },
  { "name": "Phone", "data": [500] },
  { "name": "Computer", "data": [1000] },
  { "name": "Keyboard", "data": [25] }
]

code that I've tried:

 const itemNames =  simple.map((xxx) => {

        return ("name" + xxx.namezz + "data: [" + xxx.price + "]")
    })

Tom Faltesek · Accepted Answer · 2019-09-30 15:55:42Z

4

You're on the right track with the map() method. The way you've used map() will result in an array of strings. Here's an example of using map() to get the output you requested (new array of objects).

const myObject = {
  "items": [{
      "namezz": "Bike",
      "price": 100
    },
    {
      "namezz": "TV",
      "price": 700
    },
    {
      "namezz": "Album",
      "price": 10
    },
    {
      "namezz": "Book",
      "price": 5
    },
    {
      "namezz": "Phone",
      "price": 500
    },
    {
      "namezz": "Computer",
      "price": 1000
    },
    {
      "namezz": "Keyboard",
      "price": 25
    }
  ]
};

const result = myObject.items.map(x => ({ name: x.namezz, data: [x.price] }));

console.log(result);

edited Sep 30, 2019 at 15:55

answered Sep 30, 2019 at 15:52

Tom Faltesek

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Code Maniac · Accepted Answer · 2019-09-30 15:53:55Z

2

Problem with your code is returning string whereas you need a object, i.e

return { name:xxx.namezz , data: [xxx.price] }

Alternatively you can use map and destructuring

let obj = { "items": [{ "namezz": "Bike", "price": 100 },{ "namezz": "TV", "price": 700 },{ "namezz": "Album", "price": 10 },{ "namezz": "Book", "price": 5 },{ "namezz": "Phone", "price": 500 },{ "namezz": "Computer", "price": 1000 },{ "namezz": "Keyboard", "price": 25 }]}

let final = obj.items.map(({ price, namezz }) => ({ namezz, data: [price] }))

console.log(final)

answered Sep 30, 2019 at 15:53

Code Maniac

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