Remove duplicate objects from object array

Question

I have a list of arrays i need to hide the duplicates of array

   {
        "company_name": "SERVICE INDUSTRIES LTD.",
        "claim_id": "2017\/04\/LHRHHDP00015-2018-00702",         
    },
    {

        "company_name": "KARACHI CHAMBER OF COMMERCE & INDUSTRY",
        "claim_id": "2018\/03\/HOHHDP00013-2019-00098",

    },
    {
        "company_name": "PAKISTAN RED CRESCENT SOCIETY",
        "claim_id": "2017\/04\/LHRHHDP00015-2018-00702",

    },
    {
        "company_name": "SERVICE INDUSTRIES LTD.",
        "claim_id": "2018\/04\/LHRHHDP00022-2019-01292",     
    },
    {
        "company_name": "U MICROFINANCE BANK LTD",
        "claim_id": "2017\/04\/LHRHHDP00015-2018-00702",    
    }

This is the example array i need to hide the array which have duplicate claim_id.

I already check this question but they are filtering simple values in filter . I need to filter it by claim_id. — Umaiz Khan, Aug 07 '19 at 07:06
@PierreDuc Note that the question linked as dup has indeed answers that generalize the approach to allow the selection of a "key" value... — Jota.Toledo, Aug 07 '19 at 07:11
Possible duplicate of [Get all unique values in a JavaScript array (remove duplicates)](https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates) — Jota.Toledo, Aug 07 '19 at 07:12
@Jota.Toledo I tried to look for them there, couldn't find it. Maybe you can link an answer in the comments — Poul Kruijt, Aug 07 '19 at 07:12
@Jota.Toledo although that is an answer, it's not upvoted a lot, and quite complex for what's required here — Poul Kruijt, Aug 07 '19 at 07:20

Poul Kruijt · Accepted Answer · 2019-08-07T07:26:19.193

1

You can use a filter and findIndex to find duplicates. If the index does not equal the current item, there is a duplicate.

The performance impact is maximum 1.5x the size of the array:

const unique = data.filter((item, index) => 
  data.findIndex(({ claim_id }) => item.claim_id === claim_id) === index
);

edited Aug 07 '19 at 07:26

answered Aug 07 '19 at 07:20

Poul Kruijt

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score 0 · Answer 2 · answered Aug 07 '19 at 07:16

0

To solve this easily let's use this strategy:

Extract values from the array to an object (used as a dictionary)
Eliminating duplication
Extract values to a new array

so....

const dic = {}

for (const item of originalArray) {
    dic[item.claim_id] = item
}

const groupedArray = Object.values(dic)

The only question is... where's typescript? we used native JS and managed just fine :)

answered Aug 07 '19 at 07:16

ymz

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Thanks for your answer but I think this code doubled the arrays. Mean i have 13701 arrays after using this code its showing above 20,000 arrays – Umaiz Khan Aug 07 '19 at 07:24
you should update your question and add the code you applied so it will be as clear as possible what exactly what's going on – ymz Aug 07 '19 at 07:26

Remove duplicate objects from object array

2 Answers2