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remove duplicates by id

Outrageous Octopus answered on November 29, 2021 Popularity 7/10 Helpfulness 3/10

answer remove duplicates by id

remove duplicates by id

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interface MyArray {
  id: string;
  name: string;
}

const arr: MyArray[] = [{id: '1', name: 'name'}, {id: '2', name: 'name2'}, {id: '3', name: 'name3'}];


const removeDuplicates = <T extends {id: string}>(array: T[]) =>
  array.reduce((acc: T[], item) => [...acc.filter(({ id }) => id !== item.id), item], []);

removeDuplicates(arr);

/* ======== OR ======== */
  
Array.from(new Map(arr.map((item) => [item.id, item])).values());

/* ======== OR ======== */

const removeDuplicates = (array) => array.filter((item, index, arr) => arr.indexOf(item.id) === index);

/* ======== OR ======== */
  
// find duplicates NOT remooving
const seen = new Set();
const hasDuplicates = second?.some((currentObject) => {
  return seen.size === seen.add(currentObject.name).size;
});

Popularity 7/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Nov 29 2021

Outrageous Octopus

0 Answers Avg Quality 2/10

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remove duplicates by id

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