Remove duplicates in array of objects with various properties

Question

I have an array of objects with some properties. If cod and art already exist in the array, I want to remove the repeated ones.

I created a function for this, but my result is wrong... instead of having 3 lines, I have 2.

Can anyone help me?

DEMO

.TS

 data = [
    {
      cod: 1.13,
      art: 'BCC'
    },
    {
      cod: 1.13,
      art: 'BCC'
    },
    {
      cod: 1.13,
      art: 'BCC'
    },
    {
      cod: 1.14,
      art: 'BCC'
    },
    {
      cod: 1.14,
      art: 'BCC'
    },
    {
      cod: 1.13,
      art: 'AAA'
    },
    {
      cod: 1.13,
      art: 'AAA'
    }
  ];

  ngOnInit() {
    var filtered = this.data.filter(function(el) {
      if (!this[el.cod && el.art]) {
        this[el.cod && el.art] = true;
        return true;
      }
      return false;
    }, Object.create(null));
    console.log(filtered);
  }

  //Expected Output

  // data = [
  //   {
  //     cod: 1.13,
  //     art: 'BCC'
  //   },

  //   {
  //     cod: 1.14,
  //     art: 'BCC'
  //   },
  //   {
  //     cod: 1.13,
  //     art: 'AAA'
  //   }
  // ];

Jp Vinjamoori · Accepted Answer · 2021-08-09 08:46:47Z

2

You can use map to achieve your goal

ngOnInit() {
    let map = new Map();

    this.data.forEach(eachItem => map.set(eachItem.cod + '-' + eachItem.art, eachItem));

    console.log('unique items:', Array.from(map.values()));
}

answered Aug 9, 2021 at 8:46

Jp Vinjamoori

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1 Comment

Marc Over a year ago

Thats a smooth idea with the map!

Peter · Accepted Answer · 2021-08-09 08:45:11Z

1

Try this:

  ngOnInit() {
    var filtered = this.data.filter(function(el) {
      if (!this[el.cod + el.art]) {
        this[el.cod + el.art] = true;
        return true;
      }
      return false;
    }, Object.create(null));
    console.log(filtered);
  }

answered Aug 9, 2021 at 8:45

Peter

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Comments

Ramesh Reddy · Accepted Answer · 2021-08-09 08:58:04Z

0

You can use a set to remember the pushed objects and only add if they are unique.

Here's the edited stackblitz

data = [{
    cod: 1.13,
    art: 'BCC'
  },
  {
    cod: 1.13,
    art: 'BCC'
  },
  {
    cod: 1.13,
    art: 'BCC'
  },
  {
    cod: 1.14,
    art: 'BCC'
  },
  {
    cod: 1.14,
    art: 'BCC'
  },
  {
    cod: 1.13,
    art: 'AAA'
  },
  {
    cod: 1.13,
    art: 'AAA'
  }
];

const unique = data.reduce(((set) => (acc, curr) => {
  const { cod, art } = curr;
  const key = `${cod}_${art}`;
  if (!set.has(key)) {
    set.add(key);
    acc.push(curr);
  }
  return acc;
})(new Set()), []);

console.log(unique)

edited Aug 9, 2021 at 8:58

answered Aug 9, 2021 at 8:43

Ramesh Reddy

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