Generate object from list

Question

I have an array like this: [1, 2, 3, 4, 5] and I want to obtain from it an object like this:

[
  { product_id: 1 },
  { product_id: 2 },
  { product_id: 3 },
  { product_id: 4 },
  { product_id: 5 }
]

What is an ES6ish way to obtain this?

Have you tried anything? A `for` loop, the `map` method maybe? — Bergi, May 31 '19 at 13:23
I dont't want to use a loop because I would like to use an ES6 feature. — sanna, May 31 '19 at 13:24
`const newArr = arr.map(item => { product_id: item; }); console.log(JSON.stringify(newArr));` But this gives me an array of null objects. — sanna, May 31 '19 at 13:26

score 1 · Accepted Answer · answered May 31 '19 at 13:41

Problem is in understanding how ES6 .map() return works.

Add round brackets to map, because you want to return that statement. Curly brackets just opens body with no return value. (you have to add it on your own e.g. { return {product_id: item }})

const inputArr = [1, 2, 3, 4, 5];
const newArr = inputArr.map(item => ({ product_id: item })); 
console.log('arrayLog', newArr);

Generate object from list

1 Answers1