Check array of object to find double

Question

I have an array of object like this :

array = [
   {x: 205, y: 205}
   {x: 230, y: 205}
   {x: 255, y: 205}
   {x: 205, y: 205}
   {x: 205, y: 205}
   {x: 205, y: 205}
]

I want check if my array contain the same object once( for example the 3 last objects are the same) so I want just delete them.

If I select or deselect a item , I just want the coordinates of the selected item in the array

    function selectFixture() {
      const item = new PIXI.Graphics();
      // check if place is empty
      if (this.isDown) {
        this.isDown = false;
        console.log(this.isDown)
        item.beginFill(colors[1]);
        item.drawRect(this.positionX, this.positionY, tileH, tileW);
        container.addChild(item);
        console.log(finalArray)
      } else {
        this.isDown = true;
        console.log(this.isDown)
        item.beginFill(colors[2]);
        item.drawRect(this.positionX, this.positionY, tileH, tileW);
        container.addChild(item);
        selectedFixtures.push({
          x: this.positionX,
          y: this.positionY,
        })
        console.log(selectedFixtures)
        var finalArray = {};
        for (var i = 0, len = selectedFixtures.length; i < len; i++)
          finalArray[selectedFixtures[i]['x']] = selectedFixtures[i];
        selectedFixtures = new Array();
        for (var key in finalArray)
          selectedFixtures.push(finalArray[key]);
        console.log(finalArray)
      }
    }

https://codepen.io/sebastiancz/pen/WNQLxaw

How can I do this ?

Does this answer your question? [Remove duplicates from an array of objects in JavaScript](https://stackoverflow.com/questions/2218999/remove-duplicates-from-an-array-of-objects-in-javascript) — ggorlen, May 19 '20 at 19:20
when I select multiple value on Y , it don't add in the array — TheDevGuy, May 19 '20 at 19:31
Please put it in the question itself. Links can go down over time and the idea is to curate questions and answers that are useful for future visitors, not just you. See [ask] and take the [tour]. Thanks. — ggorlen, May 19 '20 at 19:31

score 0 · Accepted Answer · answered May 19 '20 at 19:28

0

You can use the filter function and a small trick in finding the first index of the current item to remove duplicates like the following:

array = [
   {x: 205, y: 205},
   {x: 230, y: 205},
   {x: 255, y: 205},
   {x: 205, y: 205},
   {x: 205, y: 205},
   {x: 205, y: 205}
]

array = array.filter((item, index) => {
  let ind = array.findIndex(obj => obj.x+"$"+obj.y === item.x+"$"+item.y);
  return ind === index;
});
console.log(array);

answered May 19 '20 at 19:28

Md Johirul Islam

5,042
4
23
56

Can you check my codepen and tell me if I remove an element on the map , haw can I remove it from the array – TheDevGuy May 19 '20 at 19:37
I think , you answer is close that I like to have , but I can remove an element – TheDevGuy May 19 '20 at 19:50

KCFragrance · Answer 2 · 2020-05-19T19:46:03.923

0

Try This

let  array=[  { x: 205, y: 205 },
{ x: 230, y: 205 },
{ x: 255, y: 205 },
{ x: 205, y: 205 },
{ x: 205, y: 205 },
{ x: 205, y: 205 },]

const removeDuplicates =(array)=> {

   let obj = {}
   array.forEach((elem) => {
      obj[elem.x + "-" + elem.y] = 0
   })

   let newArray = []
   console.log(obj)
   array.forEach((elem) => {
      if (obj[elem.x + "-" + elem.y] !== undefined) {
        if (obj[elem.x + "-" + elem.y] == 0) {
            obj[elem.x + "-" + elem.y] = 1
            newArray.push(elem)
        }
    }


    })
    console.log(newArray)

    return newArray 
 }

edited May 19 '20 at 19:46

answered May 19 '20 at 19:38

KCFragrance

148
6

I update the my code , but it don't remove any value. Can test it with my codepen's code ? – TheDevGuy May 19 '20 at 19:47

score 0 · Answer 3 · answered May 19 '20 at 19:38

One more way to solve this.

let array = [{x: 205, y: 205},{x: 230, y: 205},{x: 255, y: 205},
{x: 205, y: 205},{x: 205, y: 205},{x: 205, y: 205}]

let sortedArray = []

array.forEach(elem => {
  if (!sortedArray.includes(JSON.stringify(elem))) {
      sortedArray.push(JSON.stringify(elem))
  }
})
sortedArray = sortedArray.map(elem => JSON.parse(elem))
console.log(sortedArray)

Check array of object to find double

3 Answers3