removeDuplicatesByProp.js

/*
* Remove duplicate object entries from an array
* @param {Object[]} arr - the array of objects
* @param {string} prop - the property used for comparison
*
* @example
* // returns [{ id: 1, name: 'apple', id: 3, name: 'orange'}]
* removeDuplicatesByProp([{ id: 1, name: 'apple' }, { id: 2, name: 'apple' }, { id: 3, name: 'orange' }], 'name');
*
* @returns {Object[]}
*/
const removeDuplicatesByProp = (arr, prop) =>
  arr
    .map(e => e[prop])
    .map((e, i, final) => final.indexOf(e) === i && i)
    .filter(e => arr[e])
    .map(e => arr[e]);

export default removeDuplicatesByProp;