Remove Duplicate value from JSON Object

Question

I have a JSON object

var data = [
{totalTime: 67, phoneNo: "400-234-090"}, 
{totalTime: 301, phoneNo: "701-080-080"}, 
{totalTime: 300, phoneNo: "400-234-090"}
]

I want to remove duplicate object. Please guide. Output should be as below one

var data = [{totalTime: 301, phoneNo: "701-080-080"}]

@Daniel This is not a duplicate of that. OP wants to remove all the duplicates from the array, not just keep all the unique ones. — Blue
– Blue, Commented Aug 2, 2018 at 2:24
Example which you have mentioned is not removing duplicate record. It is just removing occurrence. I need unique records. — Andy
– Andy, Commented Aug 2, 2018 at 2:34
@Andy did any of the answers bellow solve your problem? If so you should mark the answer. It helps others etc. — Akrion
– Akrion, Commented Aug 2, 2018 at 17:42

CertainPerformance · Accepted Answer · 2018-08-02 02:26:50Z

2

For a solution with low complexity, I'd first make an object that counts the occurences of each phoneNo, and then filter the input by the count of each object's number being 1:

var data = [
  {totalTime: 67, phoneNo: "400-234-090"}, 
  {totalTime: 301, phoneNo: "701-080-080"}, 
  {totalTime: 300, phoneNo: "400-234-090"}
];
const phoneCounts = data.reduce((a, { phoneNo }) => {
  a[phoneNo] = (a[phoneNo] || 0) + 1;
  return a;
}, {});
console.log(
  data.filter(({ phoneNo }) => phoneCounts[phoneNo] === 1)
);

answered Aug 2, 2018 at 2:26

CertainPerformance

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3 Comments

CertainPerformance Over a year ago

@Andy When an answer solves your problem, you can consider marking it as Accepted to indicate that the issue is resolved

Andy Over a year ago

@CertainPerformance can you please guide me how to accept the answer

CertainPerformance Over a year ago

You can see here: click on the check mark beside the answer to toggle it from greyed out to filled in.

Prasanna · Accepted Answer · 2018-08-02 02:40:12Z

1

You can just use two filters such that, we will only select objects that are just single entry in the array

const data = [
  {totalTime: 67, phoneNo: "400-234-090"}, 
  {totalTime: 301, phoneNo: "701-080-080"}, 
  {totalTime: 300, phoneNo: "400-234-090"}
]

const newData = data.filter(outer => 
  data.filter(inner => 
    outer.phoneNo === inner.phoneNo
  ).length === 1
)

console.log(newData)

answered Aug 2, 2018 at 2:40

Prasanna

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2 Comments

CertainPerformance Over a year ago

This has O(N^2) complexity... not important in small datasets, but probably not preferable regardless

Prasanna Over a year ago

@CertainPerformance yes O(n^2) indeed. But has less space complexity as well :)

Akrion · Accepted Answer · 2018-08-02 06:37:03Z

0

Another option (1 reduce, 1 filter and spread):

var data = [
{totalTime: 67, phoneNo: "400-234-090"}, 
{totalTime: 301, phoneNo: "701-080-080"}, 
{totalTime: 300, phoneNo: "400-234-090"}
];

console.log(data.reduce((x, { phoneNo }, i, a) => 
  a.filter((y) => 
	y.phoneNo === phoneNo).length > 1 ? x : [...x, a[i]], []))

answered Aug 2, 2018 at 6:37

Akrion

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