ES6 array of unique objects by prop

unique-objects-by-prop-es6.js

// https://javascript.info/map-set

const uniqueObjectsByProp = (array, prop) => {
  let map = new Map(array.map(item => [item[prop], item]));
  return Array.from(map.values());
};

let arr = [{ id: 1, name: 'Item 1' }, { id: 2, name: 'Item 2' }, { id: 1, name: 'Item 1' }];
let uniqueArr = uniqueObjectsByProp(arr, 'id');

console.log(uniqueArr); // [{ id: 1, name: 'Item 1' }, { id: 2, name: 'Item 2' }]