Determine distinct items in an array that match a predefined criteria

I have a list of objects with two keys, img1 and img2. I need to identify unique objects based on the values of img1, while also retaining the corresponding value of img2.

This is the current code I am using:

const imgs_arr = [
    ...new Set(
      input_arr.map(item => {img_1: item.img1[0]})
    )
  ];
  return imgs_arr;

Input Array:

[{img1: ['/path/to/img1'], img2: ['/path/to/img2']},
{img1: ['/path/to/img1'], img2: ['/path/to/img3']},
{img1: ['/path/to/img1'], img2: ['/path/to/img4']},
{img1: ['/path/to/img12'], img2: ['/path/to/img5']},
{img1: ['/path/to/img12'], img2: ['/path/to/img46']},
{img1: ['/path/to/img12'], img2: ['/path/to/img45']},
{img1: ['/path/to/img12'], img2: ['/path/to/img478']}]

Expected Output Array:

[{img1: '/path/to/img1', img2: '/path/to/img2'},
{img1: '/path/to/img12', img2: '/path/to/img5'}]

To provide more context to the question, the goal is to find unique values for img1 and then retrieve the corresponding value for img2 from the first instance.

Your assistance is greatly appreciated!

javascriptarraysvue.jsecmascript-6vuejs2

Answer №1

Implement a forEach loop to create an object with unique keys. Retrieve the values using Object.values.

const data = [
  { img1: ["/path/to/img1"], img2: ["/path/to/img2"] },
  { img1: ["/path/to/img1"], img2: ["/path/to/img3"] },
  { img1: ["/path/to/img1"], img2: ["/path/to/img4"] },
  { img1: ["/path/to/img12"], img2: ["/path/to/img5"] },
  { img1: ["/path/to/img12"], img2: ["/path/to/img46"] },
  { img1: ["/path/to/img12"], img2: ["/path/to/img45"] },
  { img1: ["/path/to/img12"], img2: ["/path/to/img478"] }
];

const update = data => {
  const res = {};

  data.forEach(item => {
    const u_key = item.img1[0];
    if (!(u_key in res)) {
        res[u_key] = item;
    }
  });
  return Object.values(res);
};

console.log(update(data));

Answer №2

function filterArrayByImg1(arr) {

  let uniqueImages = [];

  return arr.filter((element, index) => {

      if (!element.img1 || !element.img1[0] || uniqueImages.includes(element.img1[0]))
        return false;
      else {
        uniqueImages.push(element.img1[0]);
        return true;
      }
    })
    .map(element => ({
      img1: element.img1[0],
      img2: element.img2[0]
    }));
}


let inputImages = [{
    img1: ['/path/to/img1'],
    img2: ['/path/to/img2']
  },
  {
    img1: ['/path/to/img1'],
    img2: ['/path/to/img3']
  },
  {
    img1: ['/path/to/img1'],
    img2: ['/path/to/img4']
  },
  {
    img1: ['/path/to/img12'],
    img2: ['/path/to/img5']
  },
  {
    img1: ['/path/to/img12'],
    img2: ['/path/to/img46']
  },
  {
    img1: ['/path/to/img12'],
    img2: ['/path/to/img45']
  },
  {
    img1: ['/path/to/img12'],
    img2: ['/path/to/img478']
  }
];

// Filter the array for unique images
let filteredImages = filterArrayByImg1(inputImages);

console.log(filteredImages);

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