Is there a possibility to filter duplicate items by a field using Lodash?

Question

Is there a possibility to filter duplicate items by a field using Lodash?

I have an array with several items, some of these items are duplicated, what differentiates is the validade field that is different.

Is it possible to filter and keep only one item?

Note: Null items must remain

[
  {
    "oa": 1,
    "id": 168,
    "lote": "2022-05-31-1672012800",
    "tipo_estoque": "MP",
    "data_entrada": "2022-07-11 10:25:25.0",
    "produto_id": 1,
    "item_id": 2594,
    "created_at": "2022-07-11 13:25:32.0",
    "updated_at": "2022-07-11 13:25:32.0",
    "validade": "2023-05-11 00:00:00.0",
    "siaId": "02.352"
  },
  {
    "oa": 1,
    "id": 228,
    "lote": "2022-05-31-1672012801",
    "tipo_estoque": "MP",
    "data_entrada": "2022-07-11 10:25:25.0",
    "produto_id": 1,
    "item_id": 2594,
    "created_at": "2022-07-11 13:25:32.0",
    "updated_at": "2022-07-11 13:25:32.0",
    "validade": "2023-06-11 00:00:00.0",
    "siaId": "02.352"
  },
  {
    "oa": 2,
    "id": null,
    "lote": null,
    "tipo_estoque": null,
    "data_entrada": null,
    "produto_id": null,
    "item_id": null,
    "created_at": null,
    "updated_at": null,
    "validade": null,
    "siaId": null
  },
  {
    "oa": 3,
    "id": 168,
    "lote": "2022-05-31-1672012800",
    "tipo_estoque": "MP",
    "data_entrada": "2022-07-11 10:25:25.0",
    "produto_id": 1,
    "item_id": 2594,
    "created_at": "2022-07-11 13:25:32.0",
    "updated_at": "2022-07-11 13:25:32.0",
    "validade": "2023-05-11 00:00:00.0",
    "siaId": "02.352"
  },
  {
    "oa": 3,
    "id": 228,
    "lote": "2022-05-31-1672012801",
    "tipo_estoque": "MP",
    "data_entrada": "2022-07-11 10:25:25.0",
    "produto_id": 1,
    "item_id": 2594,
    "created_at": "2022-07-11 13:25:32.0",
    "updated_at": "2022-07-11 13:25:32.0",
    "validade": "2023-06-11 00:00:00.0",
    "siaId": "02.352"
  },
  {
    "oa": 4,
    "id": null,
    "lote": null,
    "tipo_estoque": null,
    "data_entrada": null,
    "produto_id": null,
    "item_id": null,
    "created_at": null,
    "updated_at": null,
    "validade": null,
    "siaId": null
  },
  {
    "oa": 5,
    "id": null,
    "lote": null,
    "tipo_estoque": null,
    "data_entrada": null,
    "produto_id": null,
    "item_id": null,
    "created_at": null,
    "updated_at": null,
    "validade": null,
    "siaId": null
  }
]

Answer 1

You are probably looking for uniqBy but it doesn't deal with the "null items must remain" criteria, here's an example:

const items = [/* your items, as described in the question */]
const uniques = _.uniqBy(items, (item) => item.validade)

If order doesn't matter then you could do it with a combo of partition and uniqBy:

const items = [/* your items, as described in the question */]
const [withNullDate, withNonNullDate] = _.partition(items, (item) => item.validade === null)
const uniquesWithNonNullDate = _.uniqBy(withNonNullDate, (item) => item.validade)
const uniquesAndNulls = [...uniquesWithNonNullDate, ...withNullDate]