trying to get id's from array of objects and push those id's into array

Question

I am trying to get the id's from array of objects using the below code

const opaqueMaterialSecondaryIds = Object.values(library?.layers).reduce((acc, opaque) => {
    acc.push(...opaque.map(e => e.id));
    return acc;
  }, []);

and getting an error at opaque.map is not function and the object is looks like as below

i am not sure where i am doing wrong with the above code. Could any one please suggest any ideas on this, many thanks in advance.

Why use reduce on layers rather than map? - It appears opaque is an object - hence, no map method. — Randy Casburn
– Randy Casburn, Commented Dec 4, 2020 at 19:57

technophyle · Accepted Answer · 2020-12-04 19:59:19Z

1

map() is an Array method and doesn't exist in an object.

Each item in your library?.layers is an object, so opaque.map is not a function.

Side note 1: library?.layers is already an object, so you don't need to call Object.values() but can instead directly use library?.layers?.reduce().

Side note 2: if your purpose is to get the ids of all opaque objects, you can just do:

const opaqueMaterialSecondaryIds = library?.layers?.map(opaque => opaque.id);

answered Dec 4, 2020 at 19:59

technophyle

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md_orb · Accepted Answer · 2020-12-04 20:01:26Z

1

If your structure is what it looks like:

const layers = [
  {
    # other attributes,
    id: 'id-1',
    # other attributes,
  },
  {
    ...
  },
];

I think all you need is this:

const layerIds = layers.map((l) => l.id);
console.log(layerIds);
# Output: ['id-1', 'id-2']

answered Dec 4, 2020 at 20:01

md_orb

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