remove duplicate objects based on id from array angular 8

1this.item = this.item.filter((el, i, a) => i === a.indexOf(el))

1function getUnique(arr, comp) {
2
3                    // store the comparison  values in array
4   const unique =  arr.map(e => e[comp])
5
6                  // store the indexes of the unique objects
7                  .map((e, i, final) => final.indexOf(e) === i && i)
8
9                  // eliminate the false indexes & return unique objects
10                 .filter((e) => arr[e]).map(e => arr[e]);
11
12   return unique;
13}
14
15console.log(getUnique(arr,'id'));

1var arrayWithDuplicates = [
2    {"type":"LICENSE", "licenseNum": "12345", state:"NV"},
3    {"type":"LICENSE", "licenseNum": "A7846", state:"CA"},
4    {"type":"LICENSE", "licenseNum": "12345", state:"OR"},
5    {"type":"LICENSE", "licenseNum": "10849", state:"CA"},
6    {"type":"LICENSE", "licenseNum": "B7037", state:"WA"},
7    {"type":"LICENSE", "licenseNum": "12345", state:"NM"}
8];
9
10function removeDuplicates(originalArray, prop) {
11     var newArray = [];
12     var lookupObject  = {};
13
14     for(var i in originalArray) {
15        lookupObject[originalArray[i][prop]] = originalArray[i];
16     }
17
18     for(i in lookupObject) {
19         newArray.push(lookupObject[i]);
20     }
21      return newArray;
22 }
23
24var uniqueArray = removeDuplicates(arrayWithDuplicates, "licenseNum");
25console.log("uniqueArray is: " + JSON.stringify(uniqueArray));

1const things = {
2  thing: [
3    { place: 'here', name: 'stuff' },
4    { place: 'there', name: 'morestuff1' },
5    { place: 'there', name: 'morestuff2' }, 
6  ],
7};
8
9const removeDuplicates = (array, key) => {
10  return array.reduce((arr, item) => {
11    const removed = arr.filter(i => i[key] !== item[key]);
12    return [...removed, item];
13  }, []);
14};
15
16console.log(removeDuplicates(things.thing, 'place'));
17// > [{ place: 'here', name: 'stuff' }, { place: 'there', name: 'morestuff2' }]
18