Sort array of objects and return array of specific values from the object

Question

I have an array of objects(product list), and I am implementing the sorting logic to it. In order to make it a single source of truth, I made a id-product map, which looks something like this:

const prodsMap = {
  1 : {
    id : 1,
    name : 'abc',
    price : 4
  },
  2 : {
    id : 2,
    name : 'aac',
    price : 3
  }
}

Now in order to sort products I am doing this:

function sortString(data, propName) {
  return data.sort((obj1, obj2) => {
    const val1 = obj1[propName]
    const val2 = obj2[propName]

    if (val1 < val2) {
      return -1
    }

    if (val1 > val2) {
      return 1
    }

    return 0
  })
}

Calling the function like this:

const prods = sortString(Object.values(prodsMap), 'name')

Everything works fine here, the result of sorting will be an array of objects, in order to get the id's I am using map function.

Now the problem is that I've to iterate thrice(first to get object values, second to sort and third time to map id's), I was wondering if there is a better way to get only ID's when the array gets sorted.

and third time to map id's But the keys are already the ids..? (if they aren't, consider converting to an object structure so that they are) — CertainPerformance
– CertainPerformance, Commented Jun 25, 2018 at 6:58
@CertainPerformance sortString returns array of objects, so keys won't be there anymore. — Bharat Soni
– Bharat Soni, Commented Jun 25, 2018 at 6:59
@BharatSoni sortString returns the sorted Object.keys(prodsMap). But the keys are the IDs, not objects. You're not sorting an array of objects, you're sorting an array of keys. (you don't even have an array of objects anywhere here) — CertainPerformance
– CertainPerformance, Commented Jun 25, 2018 at 7:01
@NinaScholz yep. But Object.keys will always returns a new list and that list is passed to sorter. — Bharat Soni
– Bharat Soni, Commented Jun 25, 2018 at 7:02

Nina Scholz · Accepted Answer · 2018-06-25 07:11:51Z

3

You could order the keys of the handed over object, to get an array of id.

If you need the ìd property of the objects, you could map the values of the outer object with id property.

const prodsMap = {
  1 : {
    id : 1,
    name : 'abc',
    price : 4
  },
  2 : {
    id : 2,
    name : 'aac',
    price : 3
  }
}

function sortString(data, propName) {
  return Object.keys(data).sort((a, b) => {
    const val1 = data[a][propName];
    const val2 = data[b][propName];

    if (val1 < val2) {
      return -1;
    }

    if (val1 > val2) {
      return 1;
    }

    return 0;
  });
}

const prods = sortString(prodsMap, 'name');

console.log(prods);

answered Jun 25, 2018 at 7:11

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Sort array of objects and return array of specific values from the object

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related