Etichetă: Tips & Tricks

Remove Array Duplicates in ES6

const array = ['🐑', 1,  2, '🐑','🐑', 3];

// 1: "Set"
[...new Set(array)];

// 2: "Filter"
array.filter((item, index) => array.indexOf(item) === index);

// 3: "Reduce"
array.reduce((unique, item) => 
  unique.includes(item) ? unique : [...unique, item], []);


// RESULT:
// ['🐑', 1, 2, 3];

https://www.samanthaming.com/tidbits/43-3-ways-to-remove-array-duplicates/

Remove duplicates from an array of objects in JavaScript

Nice and clean if you only want to remove objects with a single duplicate value, not so clean for fully duplicated objects.

export const uniqueArray = arr => {
  return Object.values(
    arr.reduce((acc, cur) => Object.assign(acc, { [cur.id]: cur }), {}),
  );
};

https://stackoverflow.com/questions/2218999/remove-duplicates-from-an-array-of-objects-in-javascript