Removing the Duplicate values from a JSON object using JS

Question

I have the following JSON object

var array = [{"id":"1","date":"2019-01-20"},
        {"id":"1","date":"2019-01-20"},{"id":"1","date":"2019-01-21"},{"id":"2","date":"2019-01-20"},{"id":"2","date":"2019-01-19"},{"id":"2","date":"2019-01-20"},{"id":"2","date":"2019-03-20"},{"id":"3","date":"2019-01-20"},{"id":"3","date":"2019-03-19"},{"id":"3","date":"2019-01-19"},{"id":"3","date":"2019-05-20"}]

And I want to have the following output by removing duplicates of date related to each id

var outPut= [{"id":"1","date":"2019-01-20"},{"id":"1","date":"2019-01-21"},{"id":"2","date":"2019-01-20"},{"id":"2","date":"2019-01-19"},{"id":"3","date":"2019-01-20"},{"id":"3","date":"2019-03-19"}]

I wrote the following code which will remove duplicate values of date but then it will remove the same date of two different ids which is wrong. how can I get the expected output?

const uniqueAddresses = Array.from(new Set(array.map(a => a.date)))
 .map(date=> {
   return addresses.find(a => a.date=== date)
 })

Kiran Shinde · Accepted Answer · 2019-07-17 08:01:57Z

1

Using es6

var array = [{"id":"1","date":"2019-01-20"},
        {"id":"1","date":"2019-01-20"},{"id":"1","date":"2019-01-21"},{"id":"2","date":"2019-01-20"},{"id":"2","date":"2019-01-19"},{"id":"2","date":"2019-01-20"},{"id":"2","date":"2019-03-20"},{"id":"3","date":"2019-01-20"},{"id":"3","date":"2019-03-19"},{"id":"3","date":"2019-01-19"},{"id":"3","date":"2019-05-20"}]
        
var newArr = array.filter((curr, index, self) =>
  index === self.findIndex((elem) => (
    elem.id === curr.id && elem.date === curr.date
  ))
)

console.log(newArr);

answered Jul 17, 2019 at 8:01

Kiran Shinde

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