ReactJS / Javascript How to remove the duplicate array from multi dimentional array?

Question

I have a multi dimentional array as following. I need to delete the previous row if the value of the particular key value duplicates

[
  {"id":5, "name":"abc"}
  {"id":5, "name":"abcd"}
  {"id":6, "name":"abcde"}
]

I need to get the result as following after deleting the previous row if the value of id already exists.

[
  {"id":5, "name":"abcd"}
  {"id":6, "name":"abcde"}
]

Do you want to always remove the previous row or just the existing row that has similar id? — Giovanni Lobitos
– Giovanni Lobitos, Commented Feb 22, 2018 at 8:07
is there only one dupe? do you want only the last one if one or more dupes? what have you tried? — Nina Scholz
– Nina Scholz, Commented Feb 22, 2018 at 8:07
its not clear from your question by what rules/criteria you want to remove a lookalike array (syntactically they're not duplicate). — izengod
– izengod, Commented Feb 22, 2018 at 8:12
@GiovanniLobitos and NinaScholz It may have more than one array with same id and i always want to remove the previous row and keep the last row. — Hareesh
– Hareesh, Commented Feb 22, 2018 at 8:53

Arman Charan · Accepted Answer · 2018-04-20 08:24:49Z

10

Map can be leveraged to produce a pretty cool one-liner 😁

const input = [
  {"id":5, "name":"abc"},
  {"id":5, "name":"abcd"},
  {"id":6, "name":"abcde"}
]

const output = [...new Map(input.map(o => [o.id, o])).values()]

console.log(output)

edited Apr 20, 2018 at 8:24

answered Feb 22, 2018 at 8:22

Arman Charan

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2 Comments

MukulSharma Over a year ago

@Arman Charan ..how its working ..could u explain a little ??

Arman Charan Over a year ago

I used the following doc references: Array.prototype.map(), Map, Map.values() and Destructuring Assignment.

Hassan Imam · Accepted Answer · 2018-02-22 08:34:35Z

1

You can use array#reduce and group your data based on id key. In case of duplicate replace the existing one. Then extract out all the values using Object.values().

var data = [{ "id": 5, "name": "abc" }, { "id": 5, "name": "abcd" }, { "id": 6, "name": "abcde" }],
    result = Object.values(data.reduce((r,o) => {
      r[o.id] = o;
      return r;
    },{}));
console.log(result);

answered Feb 22, 2018 at 8:34

Hassan Imam

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