I want to remove duplicates from array of array of objects

Question

I want to remove duplicates from an array of objects can anyone help with this to remove duplicates in the array of objects. I have an array of array of objects that I want to remove duplicates and I want to use

const firstArray = [
  {
    first: "01",
    data: [
      { id: "01", name: "test1" },
      { id: "02", name: "test2" },
      { id: "03", name: "test3" },
      { id: "05", name: "test1" },
      { id: "06", name: "test2" },
      { id: "07", name: "test1" }
    ]
  },
  {
    first: "02",
    data: [
      { id: "01", name: "test2" },
      { id: "02", name: "test1" },
      { id: "03", name: "test3" },
      { id: "05", name: "test2" },
      { id: "06", name: "test2" },
      { id: "07", name: "test1" }
    ]
  },
  {
    first: "03",
    data: [
      { id: "01", name: "test3" },
      { id: "02", name: "test2" },
      { id: "03", name: "test3" },
      { id: "04", name: "test2" },
      { id: "05", name: "test3" },
      { id: "07", name: "test1" }
    ]
  }
];

this is the sample result code i am expecting :

const firstArray = [
  {
    first: "01",
    data: [
      { id: "01", name: "test1" },
      { id: "02", name: "test2" },
      { id: "03", name: "test3" },
    ]
  },
  {
    first: "02",
    data: [
      { id: "01", name: "test1" },
      { id: "02", name: "test2" },
      { id: "03", name: "test3" },
    ]
  },
  {
    first: "03",
    data: [
      { id: "05", name: "test1" },
      { id: "06", name: "test2" },
      { id: "07", name: "test3" }
    ]
  }
];```

May you share an attempt of your own, and the expected output? — evolutionxbox
– evolutionxbox, Commented Jan 4, 2022 at 17:30
As soon as the OP does specify the definition of duplicate (here most probably any equal name value of a data item within each separate data array), the OP him/herself might get more clear about an own approach. The most important information for any approach of cause was whether one wants another array as result or one wants to mutate the original(ly provided) array reference (here firstArray). — Peter Seliger
– Peter Seliger, Commented Jan 4, 2022 at 17:52

Mister Jojo · Accepted Answer · 2022-01-04 18:11:00Z

1

this way..

const firstArray = 
    [ { first: '01'
      , data: 
        [ { id: '01', name: 'test1' } 
        , { id: '02', name: 'test2' } 
        , { id: '03', name: 'test3' } 
        , { id: '05', name: 'test1' } 
        , { id: '06', name: 'test2' } 
        , { id: '07', name: 'test1' } 
      ] } 
    , { first: '02'
      , data: 
        [ { id: '01', name: 'test2' } 
        , { id: '02', name: 'test1' } 
        , { id: '03', name: 'test3' } 
        , { id: '05', name: 'test2' } 
        , { id: '06', name: 'test2' } 
        , { id: '07', name: 'test1' } 
      ] } 
    , { first: '03'
      , data: 
        [ { id: '01', name: 'test3' } 
        , { id: '02', name: 'test2' } 
        , { id: '03', name: 'test3' } 
        , { id: '04', name: 'test2' } 
        , { id: '05', name: 'test3' } 
        , { id: '07', name: 'test1' } 
    ] } ] 
  
firstArray.forEach(({data})=> 
  {
  for (let i=data.length;--i>0;) 
  if (data.findIndex(({name})=>name===data[i].name) < i)
    data.splice(i,1)
  })


console.log( JSON.stringify( firstArray,0,2))

.as-console-wrapper {max-height: 100%!important;top:0 }

edited Jan 4, 2022 at 18:11

answered Jan 4, 2022 at 18:01

Mister Jojo

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3 Comments

Manohar Pamishetty Over a year ago

hi @Mister, i want to enter the value to filter , can i use like this data.findIndex(({name})=>name=== "test1",

Mister Jojo Over a year ago

everything is doable but i don't understand what i'm asking: filter elements on a key or eliminate all duplicates?

Manohar Pamishetty Over a year ago

thank you for helping

Sid Vishnoi · Accepted Answer · 2022-01-05 16:32:08Z

const firstArray = [
    {
      first: "01",
      data: [
        { id: "01", name: "test1" },
        { id: "02", name: "test2" },
        { id: "03", name: "test3" },
        { id: "05", name: "test1" },
        { id: "06", name: "test2" },
        { id: "07", name: "test1" }
      ]
    },
    {
      first: "02",
      data: [
        { id: "01", name: "test2" },
        { id: "02", name: "test1" },
        { id: "03", name: "test3" },
        { id: "05", name: "test2" },
        { id: "06", name: "test2" },
        { id: "07", name: "test1" }
      ]
    },
    {
      first: "03",
      data: [
        { id: "01", name: "test3" },
        { id: "02", name: "test2" },
        { id: "03", name: "test3" },
        { id: "04", name: "test2" },
        { id: "05", name: "test3" },
        { id: "07", name: "test1" }
      ]
    }
  ];


let filterValues = firstArray.map((item) => {
  let data = item.data.filter(
    (value, index, data) =>
      data.findIndex((item) => item.name === value.name) === index
  );
  return { ...{ first: item.first }, data };
});

console.log(filterValues);

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